Part Cross-reference for US 328 Rear Side Marker?

I'm in need of at least one rear side marker on my 328. New ones seem to be available ... for ~$300.

The Fiat X/19 unit looks to be very similar. (Here's an example from eBay.)

In my case, the black rear section that the bulb socket clips into is broken, so 3D-printing a new collar is not out of the question, but before I try to go down that path, are there any less expensive alternatives?

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Perfect. Thanks!