Here is the best discussion I can see for replacing the R107 or W116 coupler- though Chuck Taylor alludes to an earlier one he did, I can't find it
http://www.peachparts.com/shopforum/showthread.php?t=120671&highlight=steering+coupler
To pull the steering wheel, just pry up the pad and unscrew the bid fastener underneath. I think it may be a 10mm socket headed bolt under there, IIRC.
I ought to sell rebushed steering couplers...I swear I could finance my retirement. Let's see, how about $40 for 5 minutes of work.....