Randy,
The wheel on a 1970 280 SL is a black or ivory hard plastic wheel that's identical to the part on any number of MB sedans (W108, W114, etc. up to 1973).
A US-spec Pagoda would have a matte silver finish on the horn ring, whereas a Euro-spec wheel would have a bright chromed finish.
Go to ebay and have a look. You'll definitely find what you're looking for.
Douglas Kim
New York
USA