you have the offsets. the "ET" number is your offset. lambo uses a very deep dish in the rear. they are 14.5mm out from center of the rim. so from the mounting surface (hub or drum) you will have about around 6" of wheel going outboard. and keep in mind, that is only to where the tire bead hits. there is another 5-10mm more to the lip. then assume some sidewall protrusion depending on tire selection.
if you go with 944 suspension, depending on which one, you can add anywhere from 1-3/4" to 3" per side. shortened IRS arms may be the better option if you are going to go with rims that large.
it can be done though.
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