quote "the front half of an E34 M20 520i manual will fit, based on the logic that the 525i and 325i front halves are the same, its the rear half thats different. But Manaual E34 even harder to come by than that manual E30. edit: the E34 520i M20 may use a Getrag 260 though, im not sure."
Well the 520i and the 320i are M20B20's exactly the same.. however I thought I might be able to find a automatic e34 and grab the shaft off that as the wheel base is longer. But that said I would still be looking at a mint to get it machined down to perfect length for my E30.
It is a long story how I got ripped off but I went for the deal as it seemed cheap and no, the guy was young and turned very nasty and lied a lot. Not a great experience but unfortunately there isn't much i can do.
thanks for the help so far, it seems that the exact part I need would still be cheapest option.