I made a plate from 1/8 steel drilled 4 holes to mount to the fire wall and drilled 2 holes for MC
all holes need to be drilled in the fire wall
when I removed the vac booster there was a foam gasket with all the hole but the 2 for the MC that I drilled
I bought just the adjustable rod from master power brake for mine so it should be avalable by its self
you are looking at the wrong adaptor,that is to replace a 4 bolt mc with a 2 bolt one
sorta the asame thing but not
do you need a couple pics of mine?
I can send it to your email