We can supply CAT spare parts as following:

2W-1709 2W1709 RING
8N-3102 8N3102 PISTON
6N-9915 6N9915 VALVE
6N-9916 6N9916 VALVE
2P-1262 2P1262 GUIDE
6V-2525 6V2525 KIT VG
6V-1549 6V1549 KIT C+L
8T-2466 8T2466 KIT FRONT
4W-5698 4W5698 Main Bearing Kit-U/S
4W-5699 4W5699 Main Bearing Kit-U/S
4W-5700 4W5700 Main Bearing Kit-U/S
4W-5701 4W5701 Main Bearing Kit-U/S
253-1752 2531752 Thrust Washer Kit
368-7816/20R-0629 3687816/20R0629 Piston Kit
223-9159 2239159 Piston Ring Kit
238-2707 2382707 
246-5659 2465659 
274-8359 2748359 Piston Cooling Jet
261-3450 2613450 Con Rod Bearing
232-3235 2323235 Con Rod Bearing-U/S
232-3236 2323236 Con Rod Bearing-U/S
224-3245/10R-2117 2243245/10R2117 Con Rod
229-6259 2296259 Con Rod Bush
280-3979 2803979 Valve Seat Insert
490-7198 4907198 Intake Valve
300-3565 3003565 Valve Seat Insert
490-7200 4907200 Exhaust Valve
122-7375 1227375 Valve Guide
163-2478 1632478 Seal-Valve Stem
247-9908 2479908 Valve Spring Outer
211-3122 2113122 Valve Spring Inner
186-2001 1862001 Seat
2A-4429 2A4429 Valve Collet
263-4920 2634920 Sleeve
166-2904 1662904 Seal-O Ring
9X-7430 9X7430 Seal-O Ring
216-5582 2165582 Camshaft Bush
194-8124 1948124 Sleeve
3E-6772 3E6772 Seal
224-5122 2245122 Gasket Kit-Cylinder Head
253-0616/10R-3265 2530616/10R3265 Injector
291-5911/10R-7230/276-8307 2915911/10R7230/2768307 
253-0618/10R-2772 2530618/10R2772 
248-1394 2481394 Seal Kit
272-0390 2720390 Seal
455-3837 4553837 Valve Cover
242-9537 2429537 Seal - Rocker Box Cover
372-6764 3726764 Valve Cover
320-2797/20R-3318 3202797/20R3318 Rocker Arm Assembly
278-1365/20R-3322 2781365/20R3322 Rocker Arm Assembly
357-1315/488-1675 3571315/4881675 Cylinder Block
516-9693/556-0701 5169693/5560701 Liner-Press Fit
9L-5854 9L5854 Band
155-0809 1550809 Seal-Oil
155-2793 1552793 Seal-Oil
319-7401/142-5867 3197401/1425867 Seal-Front End Oil
142-5868 1425868 Seal-Rear End Oil
6V-1197 6V1197 Seal-O Ring
117-8801 1178801 Seal-O Ring
5E-8771 5E8771 Seal-O Ring
160-7271 1607271 Seal
166-9144 1669144 Gasket-Timing Cover
155-9524 1559524 Gasket-Timing Case
5P-0840 5P0840 Seal - O Ring
227-8851 2278851 Thermostat Housing
247-7133 2477133 Thermostat
3S-9643 3S9643 Seal - Thermostat Housing
341-1429 3411429 Seal
167-4407 1674407 Seal - O Ring
171-4358 1714358 Seal - O Ring
109-0077 1090077 Seal - O Ring
125-0434 1250434 Seal - O Ring
126-4935 1264935 Gasket
352-0211/10R-0484 3520211/10R0484  Water Pump Kit
109-0077 1090077 Seal-O Ring
9M-3786 9M3786 Seal-O Ring
122-3772 1223772 Seal-O Ring
550-5420 5505420 Seal-Water Pump
153-1256 1531256 Seal-Water Pump
336-2213/10R-8660  3362213/10R8660  Water Pump Kit
122-3772 1223772 Seal-O Ring
336-2212 3362212 Seal-Water Pump
168-5248 1685248 Gasket - Sump
5P-5846 5P5846 Seal - O Ring
5P-8068 5P8068 Seal - O Ring
223-7962/10R-2112 2237962/10R2112 Oil Cooler
332-7298/10R-7156 3327298/10R7156 Camshaft
332-7297/10R-7157 3327297/10R7157 
353-0186 3530186 Camshaft Gear
175-1483 1751483 Housing
468-5119/10R-4463 4685119/10R4463 Crankshaft Assembly
187-8981 1878981 Crankshaft Gear
149-9110 1499110 Oil Pump Gear
279-2589 2792589 Pulley-Alternator
192-1563  1921563 Pulley As-Idler
190-0643 1900643 Tensioner
161-4113/0R-9449 1614113/0R9449 Oil Pump
137-5541 1375541 Priming Pump
1P-0436 1P0436 Gasket
281-2725 2812725 Non Return Valve
384-8612/20R-1525 3848612/20R1525 Lift Pump
107-5769 1075769 Seal - O Ring
191-8303 1918303 Speed Sensor
279-9830/228-4947 2799830/2284947 Speed Sensor
256-6453/238-5080 2566453/2385080 Temperature Sensor  

We supply original parts for Caterpillar main models, as follows:

Caterpillar bulldozer:4P,517,527,54H,950G,950GII,960F,962G,962GII,962H,D10,D10L,D10N,D10R,D10T,D11N,D11R,D11T,D2,D3,D3B,D3B LGP,D3C,D3CLGP,D3G,D3K,D4,D4B,D4C,D4CLGP,D4D,D4E,D4G,D4H,D4H LGP,D4H XL,D4HTSK II,D4HTSK III,D4K LGP,D4K XL,D5,D5B,D5B LGP,D5C,D5C LGP,D5C XL,D5E,D5G,D5H,D5H XL,D5HTSK II,D5K,D5M,D5M LGP,D5M XL,D5N,D5N LGP,D5N XL,D6,D6 LGP,D6B,D6C,D6C LGP,D6D,D6E,D6F,D6G,D6G2 XL,D6H,D6K XL,D6M,D6M LGP,D6M XL,D6N,D6N LGP,D6N XL,D6R,D6R LGP,D6R XL,D6T,D6T LGP,D6T XL,D7C,D7E,D7F,D7G,D7G LGP,D7H,D7H LGP,D7R,D7R LGP,D7R XR,D8,D8H,D8K,D8L,D8N,D8R,D8T,D9G,D9H,D9L,D9N,D9R,D9T etc.
Caterpillar backhoe:414E,416,416B,416C,416D,416E,420,420B,420C,420D,420DIT,420E,420F,422E,424D,426,426B,426C,426D,428,428B,428C,428D,428E,430D,430E,432D,432E,434E,436II,436B,436C,438,438C,438D,442,442D,442E,446B,446D,450E,4P,517,54H,924G,924GZ,924HZ,928H,928HZ,930H,D4HTSKII,D4HTSKIII.
Caterpillar wheel loader:902,904B,908C,908H,910,910E,914G,914K,916,920,922B,924F,924G,924H,926,926A,926E,928F,928G,930,930G,930H,930R,930T,936,936E,936F,938F,938G,938H,944,950,950B,950E,950F,950G,950H,962G,962H,962M,966C,966D,966E,966F,966G,966H,966K,966R,970F,972G,972H,980B,980C,980F,980G,980H,988,988B,988C,988F,988G,988H,990,990H,992,992B,992C,992D,992G,992K,993K,994,994D,994F,G910,IT14G,IT18B,IT28B,IT28F,IT28G,IT28H,IT38,IT38F,IT38G,IT38H etc.
Caterpillar skid steer:216,226B Series 3,232B,236,236B,242B,242B Series 3,246,247B,247B II,252B,256C,257B,257D,259B3,262B,262C,267B,272C,277B,277C,279C,287B,287D,289C,289D,299C,299D,515,518,518C,525,525B,528,528B,530B,535C,545,545C,773B,773D,773E,773F,775B,775D,775E,775F,950E,FB518 etc.
Caterpillar heavy duty truck:769 770 772 773 775 777 785 789 793 797 etc.
Caterpillar generator sets:3066,3114,3116,S6K,3126,3126B,3126E,3145,3150,3160,3176,3176B,3176C,3196,3204,3208,3304,3304B,G3304,3306,3306B,3306C,G3306,3406,3406B,3406C,3406E,3408,3408B,3408C,3408E,G3408,3412,3412C,3412E,G3412,3456,3504,3504B,C32,C32B,GC32,3512,3512B,G3512,PM3512,3516,3516B,G3516,PM3516,C9,C10,C12,C15,C16,D13000,D311,D315,D318,D320,D326,D330,D333,D333C,G333,D334,D336,D337,D342,G342,D343,G343,D346,D348,G348,D349,D353,D364,D375,D379, D379B,G379,D386,D397, D398,D398B,G398
Caterpillar Engine:3066,3116,3126,3306,3406,3408,3412,C32,3512,3516,3606,3608,3612,C4.4,C6.4,C6.6,C7,C9,C10,C11,C12,C13,C15,C18,C27,C32,C175,C280
Caterpillar Gas engine:G3304,G3612,G3408C,G3606,G399,G3616,G3608,G3606B,G353D,G333C,G3408,G3408B,G342C,G379,G379A,G398,G343,G3304B,G3512B,G3306B