I've been calling about new rear springs, and they are telling me that firebird and the transam/formula have different springs. What are the differences. I don't want the car to sit any lower, and I want a higher weight support allowed. My car is a firebird, was original with the 5.0 tbi, but now I have a zz4 with tires sticking out of the wells and don't want to worry about eating the tires with the wells like they have been. Thanks

Heath