If that is the same as the ball joint / bushing in the rear wheel carrier on a 124, I have used the Sir Tools version of the special press, and it works fine but you must either remove the heat shield or bend it out of the way to get a clean shot at the joint. If you get the tool off just a little bit, the tool will get sideways and ruined, because it is made from soft steel. Took me two tools at about $75 per tool to replace 4 ball joint / bushings.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC