OK, old thread I know, but this is exactly the swap I'm contemplating doing, and it would be a HUGE help if someone here who's already done it could give a definitive list of what parts are needed.

I have:
an '87 300D Turbo with troublesome slushbox

I will be buying:
190E 2.3-16 transmission but nothing else

I can easily get:
190E 2.3 pedal assembly, shifter, shift rods, flywheel, clutch, master & slave cylinders

Also, there's a good shop locally that can shorten or lengthen the driveshaft as necessary and rebalance it.

What am I missing?

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AlexTheSeal: hack mechanic, inadvertent drifting champ, builder of infernal devices, professional epistemologist

'87 300D Turbo, roadtrip mileage champ (for sale!)
'92 Isuzu Trooper, mudder extraordinaire (for sale!)
'82 Honda Silverwing, cockroach of motorcycles
And various boring daily drivers...