Well you have to actually look at cars with the same 5x100 lug pattern first. Don't worry about the term backspacing, thats really only used for trucks or much older domestics. Offset is essentially how far the mounting surface of the wheel (where the wheel touches the hub) from the center line of the wheel. Basically, how much the wheel is recessed or sticks out (the higher the + offset the more it sits back in the fender, 0 or higher negative offset the further it comes out from the fender). Ideal offset for these cars depends on the width of the wheel you plan to use. It would be around +35 ~ +40 offset for 7" wide wheels. As for other cars with wheels that fit, newer 5 lug Corollas, 2000+ celicas (celica GTS wheel looks great). Also some Volkswagen and many Subarus use 5x100 but I'm not sure of their offsets.