Turbo engine & Transmission
 

300D engine & transmission listed on Ebay.

Item number: 7922478421

I would love to have a fresh spare sittin around!!

Unlike the item's description, you'd have a difficult time fitting that engine in a '76 W115 or an S123 chassis. The former doesn't like the oil filter location and the latter requires a self-leveling suspension pump in the head.

I'd love to have that engine/tranny combo to install in my '78 NA 300D, but unfortunately I'd also need a complete chassis to scavenge all the necessary mounts, brackets, and other assorted ancillaries needed to make it fit correctly.