Hi There onboroALFA,
As a thumb rule and for standard spring & shock-absorber setups, the distance between the straps passing under the rear axle and the lowest part of the axle itself (at the location where the strap passes undereath the axle) should be enough to have a 13mm or 15mm standard ratchet socket nut to sit upright neatly/snuggly between the axle and the rebound strap.
Pay attention to:
Cars with doubled straps (two strap layers sitting on on top of the other if you prefer) ..... the outer strap is longer than the other.... of course the "socket ratchet nut trick" is to be tested within the inner strap... (rather obviously)
I would assume (not wanting to be nailed on this) that on lowered cars the same should apply as with standard suspension cars.
Not sure my explanation is aboslutely clear.
(Jan 1967 1300 GT Junior, in bluette w/oxblood skai inetrior)
Last edited by Toli0815; 08-24-2018 at 02:15 AM.