summitt rear disk kits

I left messages on both of the e bay posting asking what their kits cross referenced to, will post here what I get back

then I called the Summit Tech line and asked a few questions..on the SUM-BK1329
the Tech said the rotors and pads cross reference to a 78 to 84 GM G body,, I was suprised that GM had rear disks on mid sized cars in the early 80's,, but the Summit guy confirmed,, he could not find a cross reference for the rotors,, he did offer that the kits are made by SSBC

then I called SSBC and asked about their SSB-A155,, that Tech said the rotors are designed for that kit, only available through SSBC and the rotors and pads cross to a 88-91 Ford Turbo Coup.

I asked him about the Summit SUM BK1329,, he said those are made for Summit by SSBC. When I asked about the differences in the SSBC and the Summit kits he said the pad material is different and there may be slight differences in the rotor,, but he also said the Summit kit is definately a quality kit. I told him what the Summit Tech cross referenced the parts to,, The SSBC Tech said the Summit Tech is wrong.