Hi Petri,
congratulations!
I got some numbers from BMW Mobile Tradition:
735i, 162 pcs., (BMW No.: 6781)
735i Kat, 47 pcs., (BMW No.: 6721)
745iA, 329 pcs., (BMW No.: 6961)
I'm not sure, but I believe these numbers only represents the ones with LHD that were build for the EU market.
There where additional E23 with full leather option:
The US-L7 and about 120 or 150 cars made with RHD for the japanese market.
Not to forget the M7 of South Africa.
Did I miss anything?
Have fun restoring this great car.
Oliver