easiest upgrade on an EF for the brake MC is to upgrade to the 88-89 prelude, which is a 15/16" and is a DIRECT bolt-on to the stock EF booster...

if you use the DA MC you have to use the DA booster....

the non ABS DA MC is 15/16", where the ABS version is 1" but the lines are bigger and at a different angle which= a PITA!

if you need anymore info on this subject lmk i have links to alot of info on this stuff....