I guess the question I have is why you feel the need to reinforce the trans mount? It isn't exposed to the heat, vibration, or fuel spills that the engine mounts are. If your transmission isn't dumping oil all over the place, a good quality mount should last a decade or two easily.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

Gotta compensate for that awesome 143 horsepower produced by the mighty OM603 I guess.

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Only because of the "inferior" quality of the non Mercedes mount, to make it last longer.

__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).