I have recently installed a diesel engine in my 1987 230GE and still have the complete engine and 4 speed transmission that I removed last year.
The 230 GE engine is a replacement engine that was fitted in Germany by the previous owner at 115,000 km and the vehicle had 180,000 km when the engine was removed. I expect that the original engine manifold was retained when the new 230 engine was installed however. The invoice (in German) for the purchase and installation doesn't specify either way.
So, I can remove the manifold if you need one, 'tho its probably less costly if you can find one nearby and can avoid the trans-continental shipping.
Please email me if you are interested.