The shocks are close to similar but different. The overall length on the T3's is a half inch shorter, while the stroke is about a quarter inch shorter as well. I stock parts for Tom's Snowmobile here and the T3 Evol's I've had through are different numbers than the non T3's. If I remember right, the T3's are 16" CTC with a 5.28" stroke, whereas the non T3's are 16.5" CTC and a 5.5" stroke. We've had some trouble fitting RC's on the T3 front end because of clearance issues. Be cautious with that.