I wouldn't think that more than 1 company is making those bezels, being a limited market.
Whether there are different grades that different vendors get, could be possible.
RE: assembly vs replacement parts - I've heard a few times that stuff that fell short as an assembly-line part became dealer parts inventory.
Don't know if that's actually true, but I've seen less-than-perfect dealer parts through the years.
If in the 70-80's you ordered say a trim pc. from a dealer & waited for it to come in.
When going to pick up you noticed some inperfections & said no, order another or didn't pay.
Dealer would likely just throw in his parts shelves & not return to chrysler.
Later you had guys traveling country buying old/nos stock from dealers.
Classic was Downer (NJ) & was it Jim's (Howell NJ)?
