I am building an ITB Celica GTS. It has the same rear suspension as the same year Supra, i.e., independent rear. That is the good news. The bad news is that no one makes ride height adjusters for the rear. The question: the NASCAR boys have adjustable spring perches available for the 5-5 1/2" springs. However, they would require cutting and welding in the rear suspension arm for installation. Either that or weight jack bolts in the supper spring perch. Comments, please. Thanks for your interest, Chuck