You can actually buy everything from your local Honda dealer also, just make sure you get the correct fiber. (Not the part number with a quantity of one, it is the part number with a quantity of 6 I believe.) The fibers used in the TRX450R are the same part number as the 700XX ones, so I already had a few extra fibers laying around.
As for springs, I also used what 450R guys are using, CR500 springs. The part numbers of the springs are also the same between the 450R and 700XX and I know alot of people who use CR500 springs as heavy duty springs in their 450R, so figured I would give it a shot in the 700XX also. (I just ordered 2001 CR500 springs, but I think they have been the same for the last decade the CR500 was produced.) I ordered 6 CR500 springs, but not exactly sure how many I will use yet, will experiment some to see how stiff the clutch lever gets.
Haven't had a chance to try the clutch yet, motor has been apart getting some work done, hopefully I will have it back together in a couple more weeks.
Doug