Wanted: Auto Trans Output Shaft Socket

[gcw206]

I need to buy/rent a socket to remove the three-legged output flange from a 1969 280SL automatic transmission (Type K4A 025).  OE MBZ Tool P/N 186-589-11-07-00; Sir Tools #M-0029.  I think that AST Tools makes one as well, but I don't have the P/N.  Photo/description on page 27-28/1 of BBB.