We have a shed load of Used 89-96 Corvette ZF S6-40 Transmission Cases, these are the rear shifter cases, some come with bushings, which you have to consider, they have sat for 20 + years, so likely they have scratches and such, i will pick the 1st one on the shelf if you buy, it may or may not come with a bushing, all cases are damage free and are just dirty, no damage and all probably very low miles. 

I have had in stock for 20+ years and have probably close to 20.