I just found them.

They are called ASA type 15.

The original size is 15 x 7".

The original finish is paitned silver, and they go for $109 each.

Most owners like the look of the chrome wheels, and they sell for $215 each.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".