Here's what it should look like with the camber plates you have:
(the purple camber plate sits on top of the silver piece, but don't worry about that right now)
The black metal upper spring perch that sits right on top of the spring should have a flat top. And then there's another piece that helps everything rotate freely.
It looks like yours (in purple) is cone shaped but it is hard to be sure. The cone shaped piece is what you would use for standard factory top mounts. That is what I've been thinking from the beginning.
- Andrew