BBS rims

[lwjanzen at hydro.mb.ca (Janzen, Lawrence)]

Hello everyone,
I am in the process of looking for 15" BBS basket weave wheels (4x100)
for my '87 Scirocco but I have a few of questions about BBS, KBA, Lemmer
etc. 

Q1.  BMW wheels made by KBA or Lemmer, are they BBS wheels?
Q2.  Corrado BBS wheels have an offset of 33et, can I run an offset of
41et or will I need spacers? (Running stock suspension)
Q3.  What is the difference between BBS RA, RM, RZ etc? Is there a
website that shows all the differences whether 1, 2 or 3 piece? 
Q4.  Is anyone on the list planning on selling their BBS wheels now or
in the future?

Thanks for the help,
Winnipeg Larry