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
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
274-6718/214-7566 2746718/2147566 Air Pressure Sensor Kit
274-6717/214-7568 2746717/2147568 Air Pressure Sensor Kit
274-6719/214-7566 2746719/2147566 Oil Pressure Sensor Kit
256-6453/6V-6609 2566453/6V6609 Temperature Sensor
255-5285/478-7933 2555285/4787933 Engine Control Module
372-2905/10R-5647/478-7932 3722905/10R5647/4787932 
354-0049 3540049 Wiring Harness
425-0289 4250289 Wiring Harness
345-7243/20R-2917 3457243/20R2917 Turbocharger Gp
362-0838/10R2970 3620838/10R2970 Turbocharger Gp
345-7244 3457244 Cartridge Gp-Turbocharger
302-1410/10R-8224 3021410/10R8224 Cartridge Gp-Turbocharger
1S-4295 1S4295 Gasket-Turbocharger
352-1752 3521752 Gasket
101-3125 1013125 Gasket
1R-1808 1R1808 Oil Filter     
1R-0762 1R0762 Fuel Filter
514-4549 5144549 Big End Bearing Kit
211-0587/211-0588 2110587 Main Bearing Kit
 2110588 Main Bearing Kit
246-3144 2463144 Thrust Washer  
388-2310/524-6478/197-9326 3882310 Piston Kit
 5246478 Piston Kit
 1979326 Piston Kit
434-9019/300-3086/265-1113415-7459/331-6025/265-1113 4349019/4157459 Piston Ring Kit
 3003086/3316025 Piston Ring Kit
 2651113 Piston Ring Kit
248-1467/394-4400 2481467 Valve Exhaust  
252-7802 2527802 Valve Inlet    
224-1270/300-3566 2241270 Exhaust Valve Seat Insert
260-4855 2604855 Inlet Valve Seat Insert
268-2953 2682953 Valve Guide          
263-4920 2634920 Sleeve         
469-5315 4695315 Liner
247-7133 2477133 Thermostat
249-0713 2490713 Injector Kit
478-7933 4787933 Ecm Module
352-9848 3529848 Starter Motor
5N-5692 5N5692 Alternator
247-2965/390-9415 2472965 Turbocharger
274-6718/214-7566 2746718 Air Pressure Sensor Kit
 2147566 
279-9828/228-4947 2799828 Crankshaft Speed Sensor
 2284947 
279-9829/228-4947 2799829 Camshaft Speed Sensor
 2284947 
274-6717/214-7568 2746717 Air Pressure Sensor Kit
 2147568 
256-6453/6V-6609 2566453 Coolant Temperature Sensor
 6V6609 
274-6719/214-7566 2746719 Oil Pressure Sensor Kit
 2147566 
256-6453/238-5080 2566453 Intake Air Manifold Temperature Sensor
 2385080 
281-2725 2812725 Non Return Valve
1B-3867 1B3867 Water Pump Bearing Ball   
8T-9598  8T9598 Water Pump Retainer
8C-3100 8C3100 Seal           
223-9143 2239143 Water Pump Impeller       
221-9392 2219392 Cylinder Head Gasket    
226-4755 2264755 Front Seal Oil
160-2323 1602323 Rear Seal Oil
7C-1583 7C1583 Gasket         
226-4757 2264757 Seal
9Y-0821 9Y0821 Sleeve         
9Y-0810 9Y0810 Sleeve         
131-3718 1313718 O Ring         
437-1409 4371409 Seal-Liner
9X-7317/230-3728/230-3775 9X7317 Kit, Seal-Injector
 2303728 
233-5220 2335220 OIL PUMP
9X-7430  9X7430 Sleeve Seal O Ring           

166-2904 1662904 Sleeve Seal O Ring    

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