I'm starting a new thread specific to my project as to not further dilute the original non MB transmission thread. I dropped off my design, bellhousing and T5 input shaft bearing retainer with the fabrication shop today. I should be able to pick it up in a few weeks. I'm having it made as a rectangular plate with no bolt holes. When I fit it up I can determine the shape to provide for the overlap of the 2 mating surfaces. Not sure of the cost but I can't imagine it would be that much for a steel plate with a hole and a groove. I may have the plate surfaced to assure absolute flat and parallel surfaces.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT