1974 Dart SE 2 door rear window pivot rollers

Hey y'all, I noticed both rollers are long gone from the pivots on both my rear windows, and I can't for the life of me find replacements. Found some for 72 and older, but not for my year. Any ideas? The windows do roll up and down, but I'm sure there is a reason those rollers were there.

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I made rollers out of nylon bushings from ace hardware.
Put it on a 1/4 x 4 stove bolt and chucked it up in a drill to shape it, then used a moto tool with a ball bit to groove the center on the inside.
Then they snap right on the metal ball.
Benn probably 7 years now without any failures, and in the summer those windows roll up and down a lot.

Something like this is what I started with.

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