Transmission mounts are what the Automatic transmission sits on. The need to clear the transmission from hitting anything (causing noise and vibrations).
Small shimms need to be placed to achieve this clearance. See the manual for instructions.
This is what the mounts look like. Sheered rubber inside these mounts are not uncommon.
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Transmission mounts of Automatic and manual gearbox for a 1987S4 onwards 928 model are identical. This is the URO aftermarket part:
Item specifics
URO: 92837504516
Brand: URO Parts
Manufacturer Part Number: 92837504516
Number Of Mounting Holes: 1
Mounting Hole Quantity: 1
UPC: 847603087102
Material: Aluminum
Thickness: 60 MM
Type: Transmission
Interchange Part Number: URO-012514
Length: 112 MM
Width: 96 MM