Man, I would find a way to transplant that armrest. I have an 83sd I just put 420sel 1990 seats into. My armrest is one of my favorite parts of the car.

Best thing to do is measure the distance between the bolts. length and breadth. That should give you enough confirmation to start the swap. the fact that they are both manual should make it very straightforward.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg