I have two sets of CalTracs, for two cars. It’s been quite a few years since I got them, but pretty sure I remember they asked which rear end housing I had in the cars - Stock, swapped, etc., In other words they asked all the pertinent questions, and sent the brackets that applied. No weld on parts needed, it is all ready to bolt together. I don’t know what to tell you, other than the brackets are for an application different than yours.