ATV Shock Front Features: Unmatched reliability and performance from high-tech materials. Manufactured to exacting standards so the engine can be rebuilt with total confidence. Meets or exceeds OEM quality. Direct OEM replacement. Please see image before ordering to avoid mistakes. Best value for money. ORO products are a high quality replacement part and carries our guarantee of your satisfaction. Easy to install but if unsure please use a professional. Compatible Models: SPORTSMAN 400 2001 BUILT AFTER 01/03/2001 SPORTSMAN 400 2002-04 SPORTSMAN 400 2005 IF BUILT AFTER 06/09/04 SPORTSMAN 450 2006 IF BUILT BEFORE 29/07/05 SPORTSMAN 500 2004 SPORTSMAN 500 DUSE IF BUILT AFTER 01/03/01 SPORTSMAN 500 HO IF BUILT AFTER 01/03/01 SPORTSMAN 500 HO IF BUILT BEFORE 29/07/05 SPORTSMAN 500 HO 2006 IF BUILT BEFORE 29/07/05 SPECIFICATIONS POSITION TOP HOLE I.D MM: 10 TOP EYELET WIDTH MM: 30 BOTTOM HOLE I.D MM: 10 BOTTOM EYELET WIDTH MM: 35.5 TUBE O.D MM: 50.8 STROKE MM: 127 SPRING OD MM: 81.5 SPRING WIRE DIAMETER MM: 9.5 SPRING RATE LBS/INCH: 112 SPRING RATE KG/MM: 2.00 CENTRE TO CENTRE MM: 408 CENTRE TO CENTRE IN: 16 BRONCO REF; AU-04301. REPLACES OEM PART 7041959 KIMPLEX/OEM REF; 100597 WILL FIT THE FOLLOWING; DIESEL 2001