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It only matters since I already bought a VW booster.. and if the diameter does not differ much between the Mk2 VW and the e21 id rather keep my booster than spending more money and replacing it with the e21 one.
E30 stock booster
10.75” diam x 4.5” thick (firewall to master mounting face)
Firewall mounting holes = 2-7/8 x 2-7/8”
Firewall center hole req’d = 2.37”
Firewall to end of threaded rod = 4.125” (m10x1.5)
Master studs = 2.37” c to c
Master bore hole = 1.67”
E21 320i stock booster
9.5” diam x 3.5” thick (firewall to master mounting face)
Firewall mounting holes = 2-7/8 x 2-7/8”
Firewall center hole req’d = 2.37”
Firewall to end of threaded rod = ?????” (m10x1.5)
Master studs = 2.37” c to c
Master bore hole = 1.67”
if you can forward the other dims, i can updated this post to include the mk2 booster. cheers, jason
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