1980 XT500 Shock Length/ Road Race

I'm building a XT/SR500 race bike for the pre82 class. The XT frame is 7 kg lighter than the SR. I purchased a frame only and I'm not sure what the correct shock length should be on the XT. I'm not sure however if I should use the same length on a road race bike.

Possibly it may need to be a bit shorter as the XT bike may have been a bit higher off the ground to cater for the 100 mm extra travel it had.

Any suggestions on how to get the correct length would be great.

Thanks Wallace New Zealand

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