Width between rockers?

Anyone know how wide a MK1 is supposed to be …side-to-side from edge of on rocker to the other? Getting ready to start drilling holes in the top of mine to get them fastened down. Currently, the want to be at 66 1/8”.
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With AP bodies, the rear clam and spider have flex to them, so rockers will dictate their width. I think 66” is close to what RCR cars use.
 
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