You need to measure what diameter the fork is. It should be anywhere from 27-33mm. I think the ideal length should be around 26-28 inches. Anything longer will give you the chopper look.
Here are a set of aftermarket triple clamps. They are for the smaller tubes.....27-30mm.
http://www.ebay.com/itm/151427275807...84.m1555.l2649
* 1978 ATC 90/180 Pauter PJ1 / Springer "Team BAPP" Bike *
* 1980 ATC 110/180 "Danny's Machine Works" 3D Sprint Dune Bike *
* Nicholson 500 Race Bike *
* HPATC Yamaha RD350 "Big Moe" Trike *