QA1 Promastar, single or double adjustable. Dont know the exact lenght, you have to measure it. Stock irs shocks are about 11"-16".
Use around 350-425 lbs springs with stock weight drivetrain and mild engine, more hardcore motor etc maybe 450-550 lbs springs.
On steel irs arms you might have to drill another hole to the arm, see here:
http://www.germanlook.net/forums/sho...&highlight=QA1
Here are QA1 shocks on aluarms at Humbles car:
http://www.germanlook.net/forums/sho...t=7848&page=19