Exactly. There is a center screw to hold it to the body but a circle of
projections on the back bite into the body as it is tightened down, so
more contact area than just the screw. Common to some other VWs. I have
changed out some very ugly ones on Vanagons with nice ones I have pulled
from junked VWs. The other VWs also suffer from ugly ones but I find
some are still nice enough to grab for spares. It looks like VW still
sells them.

321 971 519A  about $10

some parts lists claim it is superceded by

171 971 519A
I have not checked how similar they are or are not.

Mark

Alistair Bell wrote:
> Oh I think they might be steel too, but with plating of something. They have little projections on the hidden side that I guess are supposed to bite into body a little.
>
>