Need help finding a nearly impossible to get brake caliper

I have a 2021 Freightliner Cascadia. It uses caliper part number WAB 640 322 107 0, Since 2023 I have had to replace FOUR of these. Every time I get brake work done, one of the Adjuster Plug Pins snaps. The pin’s body is paper thin, completely unfixable, and that means replacing the entire caliper every single time. That is $1,000 a pop.

The bigger problem is finding them. I have had to sit for no less than a week every time I have needed one. And here I am again, stuck, because the ABS tone ring needed replacing and once again the pin snapped.

Part situation:

• Right side: Original part WAB 640 322 105 0 → replaced by WAB 640 322 190 0 (discontinued, no alternative). They now tell you to order WAB 640 322 107 0 (full caliper brake kit, also discontinued and only available as a special factory order, which can take months).
• Left side: WAB 640 322 104 0 → replaced by WAB 640 322 189 0 (also discontinued, no alternative).

Excelerator Parts even has this footnote:

FOR THIS EXCHANGE CALIPER, PLEASE CREATE AN APC TICKET. SUPPLIER IS CURRENTLY HAVING SOURCING ISSUES AND THERE ARE NO ALTERNATIVES CURRENTLY. PLEASE DO NOT CONTACT THE CAC FOR THIS. CAC WILL ALSO DIRECT YOU TO CREATE APC.

I am looking for any leads on where to find these calipers faster so I am not stuck sitting for weeks or months every time this happens. If anyone has a source, cross-reference, or even a trusted rebuilder, please share.

 

I appreciate the help. I would've loved to add a photo, but I wasn't exactly sure how, I'm new to forums that don't support embedded pictures. But it seems I can actually upload a picture in the reply section. Odd.

 

I'm still new to this forum and posting so I'm still getting the hang of adding pictures. Here's a picture of the caliper and the adjuster screw. I am referring to.