I just got a '69 Convertible last week and want to know what the max wheel/tire sizes are without cutting glass (although that's not entirely out of the question). I want to go with some big wheels (17-20") and tires.

I heard someone mention offset trailing arms but don't know where to get them or how much extra room this will provide.

I want everything tucked up nicely inside, not sticking out of the fenders.