R107 is the chassis designation.

I think the actual chassis designation is W107. Mercedes didn't start using the "R" prefix until the R129 convertibles were sold starting in 1990.

So, in other words, W107 convertibles have the same chassis or body style, even when the engine changes, i.e.:

1972-1980 450 SL
1981-1985 380 SL
1986-1989 560 SL

In Europe, they also had other engines, and the badge read 280SL, 420 SL, 500 SL, etc.

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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".