Thanks everyone for the feedback.
Yes the 77 forks only have the 1 drain nib at the back & aren't as long under the axil.
As it happens I do want the forks for a HL, I have 43s on it now & race it in evo but want to make it pre78.
I am also chasing a 77 Husky CR250/390 frame & swingarm as I want to build a replica of the original prototype HL. I already have the seat & tank, wheels, parts to make an engine & a 34mm Amal carb.
Any leads will be appreciated.
I guess I will have to limit the fork travel until such time as there is an amendment to the rule?
AL