The one in my picture is the "KFD-100-109"
 I believe KTM and GG used the same fork & caliper
 combo back then.
 Mine fit perfectly with the exception of the mod
 I mentioned. I am curious if the KTM axle would
 be a direct swap. I know the diameters are the
 same, but, is the total length and the machined
 wheel spacer distance correct for GG? I don't know.
 If I find someone in camp some day with the right
 year KTM. I will ask them if I can try and see ft it
 will fit.
 Enjoy. Jeff So. Cal.