This kit allows you to install an E63 brake booster on your E30. Kit includes:
 
(1) Booster spacer for your mounting location (Plese Choose Option on the Right)
(2) M12X1(mm) to M10X1(mm) Brake Line Fitting Adapters
 
Besides the items listed above, you will need to massaged your brake lines a bit to meet certain angles due to your master cylinder being shorter. 
 
Please Note : You need a complete brake booster with master cylinder and clevis pin from same car.