I'm trying to do some initial measurements for fitting my S50 and Getrag 260 into my BMW 2002. I need to know the length of the shift arm for a Getrag 260, seen here (#1):

I know I could just buy one, but I'm way far away from actually needing one. I have a lot of fitting, fabricating, stripping, media blasting, painting, and then I'll be putting stuff together correctly. I know I need a lot of things for the fitment, but honestly I don't feel like waiting on these particular parts this time. I just want the arm length so I can get started here.
Another question. Is there a shift linkage kit out there that shortens the length of the shift arm and the associated parts. Like maybe a Mini Cooper setup would have it much shorter. I want the engine as far rearward as possible and am hoping to need to cut the firewall to get it there. Just estimating the length of the stock shift arm, assuming I'm still using the stock shifter hole in the shell, it puts the engine about 3 inches forward of the firewall. Thanks for any answers you can give.
Michael

I know I could just buy one, but I'm way far away from actually needing one. I have a lot of fitting, fabricating, stripping, media blasting, painting, and then I'll be putting stuff together correctly. I know I need a lot of things for the fitment, but honestly I don't feel like waiting on these particular parts this time. I just want the arm length so I can get started here.
Another question. Is there a shift linkage kit out there that shortens the length of the shift arm and the associated parts. Like maybe a Mini Cooper setup would have it much shorter. I want the engine as far rearward as possible and am hoping to need to cut the firewall to get it there. Just estimating the length of the stock shift arm, assuming I'm still using the stock shifter hole in the shell, it puts the engine about 3 inches forward of the firewall. Thanks for any answers you can give.
Michael