Rear spring isolators?

Iwas wondering I would like to get new ones, what do i order them for? I ahve a86 Z28 that I lowered and IO would like to bring hte rear up a bit, I stock ones are worn out. Thanks.
P.S I heard that they don't make the 3 rd gen ones now, so what car do i order them for?

4th gen cars have identical rear supension systems
use rear spring isolaters for a 4th gen, it will work the same