Brent,
Here are some numbers, compiled from threads here in this forum about a year ago when we were discussing this:
Fork upper tube diameters:
GG Zoke 45
54mm - upper
57mm - lower
GG Sachs 48
54mm - upper
59.3mm - lower
Husky KYB 48mm
54mm - upper
59mm - lower
47mm Showa (CRF450X)
54.5mm - upper
58.5mm - lower
I did not verify the accuracy of all this for obvious reasons, but ScottyR is a GG and Husky dealer and did verify the Husy KYB fit.
My last thoughts on this were if the Yam KYB 48mm SSS forks are the same diameters as the Husky, a GG/Sachs lower clamp, a set of these and a front wheel/caliper from a blown up YZ would be a good solution. There is even mention of the fast Euro GG riders doing this. Good luck it would be cool to see it done.
Oh, and GG clamp offset is 21mm
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