bucket set sliders - bearing cage or cradle

I'm rebuilding the sliders for the bucket seats in my 1970 Dart. Inside each track there are two sets of bearings (one on either end) and the set consists of a roller that takes the weight of the seat and two ball bearings that allow the two parts of the slide to actually slide. Here is a picture taken during disassembly:
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The roller and two ball bearings are held in place by a metal cage or cradle:

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There are 4 cradles per seat or eight altogether and half are mirror images of the other half. One of each kind was mangled in the track when I took them apart (no wonder the seat didn't really slide). I am looking for one of each of these cages (all the ball and roller bearing are OK, but nobody sells these parts, that I can find). A poster here says they are the same in the same style of bench seat sliders, but I don't have any access to any trashed seat sliders here. If you have some of these, or know of a source for new ones please send a PM. Here is a picture of the type of seat slider:
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