Are you referring to the top nut on the tranny mount? It probably won't help you at this time, but there is a wrench that's found in some older MB tool kits and many BMW tool kits.

It’s a “dog bone” Heyco No. 450 style with a 17 mm and a 19 mm ring that is perfect for that job. It’s a 12 point and the ring itself is quite thin and the wrench itself is quite thin, that makes it perfect for the tranny mount's top 19 mm nut in that confined space on the tranny tail.

It’s also the perfect wrench when you use the 17 mm ring for the nuts on the differential side of rear flex disk where there is very little room between the nut and the differential and there is very little space around the circumference of the nut. This wrench can get on the nut and prevent you from rounding it. If you're talking about the nuts on the front flex disk this is the answer for them also And even being thin as it is, being a Heyco it's of good quality in material and fit on the fastener. I always check the BMW trunks in the bone yard for these!



If you are referring to the tranny mount’s top nut, a six point tool may not work as you’ve only got a very short swing on the wrench there before you hit the vertical rib on the side of the tranny tail, if you can get the wrench on the nut you probably can’t turn it enough to allow it to get it on the nut for the next pull because you've got less than 60 degrees of arc to swing the wrench!