Bucket seat restoration

[Blazerowner]

I'm looking for information on restoring the cst bucket seats for my 72 blazer. I will be going with the highlander covers as they were originally equipped. I have new foam and am in the process of stripping the frames. I see there are clips that look a bit like paperclips. I'm thinking they hold the foam in but don't see any wire above the foam in the crease. They were just sitting the holes in the foam. I did a search for a thread on this with no luck. I would also like to replace the springs and wonder if there is a source for these parts.