All said Parts Books list only one number in section 7.540 - PN 200807, head light door. Of course that doesn't mean they were all constructed the same. A few years ago I pulled all of them from the KFs at a salvage yard in western MN. Most were from 1947-50 cars and all had stainless steel head light rings. I've since sold all of them.
Attached is a pic I found from that place, of a car we did not grab any parts from.
This was an interesting '47 Kaiser. It had the one piece script on the hood but the seperate letters on the trunk lid. A close look at the pic shows what appears to be rust on the head light rims which is strong evidence that they weren't stainless steel! I know the '48 Frazer I had had stainless. Perhaps there were multiple suppliers out there and you could encounter some of each? Not unusual for KF cars.