80 wheels on a 90 are about the same as 90 wheels with 30mm spacers. Simon had some and then got a set of 80. Result without spacers was the same. I had 30mm on my 90 at one point and so has Cleanandgreen. Never had an issue with them rubbing. I found that tyre choice made a bigger difference on rubbing that spacers did. BFG muddies are very square and rubbed - 265 75 16.
OK, I think I get it now. If I were to order modular wheels (I'm looking at the rim tyre combos that some offer), will the seller know what offset I need for a LC90, or 80..? Or do I need to be able to tell them exactly what I am after?