WTB M103 (190E 2.6, 260E, 300E) manual driveshaft
 

Looking for a manual driveshaft front section for an M103.

These guys did a decent job of making one for me : americandriveshaft

Think I had one that was too long and they just shortened it, you have more luck finding one from a 4 or 5 cyl (gasser/diesel). The problem then becomes the BCD on the flanges and the DS itself is thinner (I know your looking to turbo).

What kind of trans are you going to use?

I agree, just get one modified/shortened.

I'm using a 5 speed w/ overdrive, either a 717.430 (single mass) or 717.433 (dual mass). One transmission is going on my 3.0L that I'll eventually turbo, the other will either go on my 190D or my other Sportline that my mom drives. I have one manual driveshaft, just need a second, the modified one won't go on the turbo car.

There are some good shops out there for modifying driveshafts. I had that done on a V8 swapped Toyota that I built and it worked out well for the time I had it.