Unfortunately the subframe recall only covered the US model 350 and 450 SL and SLC.
I have a 280SL and there have been failures of the 380SL. Every SL up through 1985 is susceptible.
1st pic is my '81 280SL.
http://www.benzworld.org/forums/r-c107-sl-slc-class/1450267-sub-frame-recall-information.html