Do you still have the link? Or at least the proper keyword search phrase for this?
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BMW E46 door lock repair:
https://www.ebay.com/itm/For-1998-06...AAAOSw-kdXyQcg
Is that the part that is "broken"?
Then with this I dont need to get a specific key made for this lock again?
I was looking at this and now this one seems like a fool's errand for $120:
https://www.thebmwminipartstore.com/...er-51217019973
I've only encountered cracking/breaking of the cylindrical pot metal parts that allow the key cylinder to rotate without resistance so the door won't unlock. The parts are included in the eBay kit. I replaced all the old parts with the new ones while it was apart. Then was able to use my original key.
Search for "bmw e46 lock repair youtube" & you'll find instructional videos. Good luck!