Hey, I'm in Raleigh NC also.... I just replaced the motor mounts on my 83 300D weekend before last. Yep, they are both the same. I reused the original heat shields, also of note, I had to cut down a L-shaped allen wrench to fit in there... I only removed the engine shock on the drivers side, as I remember.
Call me voice if you need anything... 919-291-4195 cell.

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Steve Ayscue
'83 300D
'87 300SDL
'98 Dodge Ram Diesel
22' Hydrasport