D100 window regulator wheels

While changing the weatherstrip on my 73 d100 I found that the wheels on the regulators are broken off. Have any of you replaced just the wheels? I've found entire regulators online for sale but can't find just the plastic wheels. My regulators work fine, just looking for the wheels. Thanks guys for any info!

LMC Truck

Number 3 on bottom diagram

I think those are different? Says 79-93? Is that the years? Thanks Larry.

Shoot I saw 72-93 at top of page. Sorry about that.