Collar?
I went to Pelican and found the following picture in the door latch "how to" tech article.
Do you mean the black plastic connector arm in this picture (green arrow)?
BTW, nice to know there's a Porsche recycler nearby in CenTex (I'm in Austin). I have four (4) 944s and I hope to get 2 complete cars out of them (one an auto to manual conversion and other an LS3 conversion), so maybe you'll be interested in the parts I don't need after I'm done (is there much of a market for 944 body parts: doors, glass, suspension, etc.?). FYI, I also have a 924S, 1973.5 911T and an '86 928S.