What is this part called?

Good morning all.  I’ve got a question that, while it might be better aimed at GJ, I figured I’d ask around here first, as I don’t really frequent those forums much.

I need the plastic piece that goes on a door strike post of a Jeep Cherokee.  I found a picture of the whole assembly, which I’ve pasted below.  All I need is the plastic piece and not the whole bolt / post.

Does anyone know what this part is and if you can buy just the plastic piece.  I don’t especially want to shell out $30 for the whole assembly when I just need the one part.

Thanks and have a great day.

I don’t have pretty knowledge about it.

That part may be purchased from an auto recycle center (junk yard).