go to
www.bimmerparts.com -klick search by vehicle-klick our catalog-klick year 1991-klick BMW-klick 750iL (E32)-klick climate control.
There you have the option to klick to the parts with pictures and prices: interesting for you are
A/C control unit (maker Programa/probably not original BMW standard)$ 313,43
A/C blower motor $ 188,65
A/C evaporator temperature sensor $ 25,08
A/C limit switch = "sword/Schwert" (only for Behr as replacement from Programa) $ 183,08
The price for the new Programa Schwert looks cheap in comparison to BEHR. Usually a used one in Germany costs about Euro 75-100, I guess.
If you want to buy used partsor need information about those prices, there is one webpage in Germany which shows the parts pictures new price, used price and the weight. So you can get an idea about freight charges also and see the parts.
http://www.gebrauchtee32teile.de