I take it you're trying to figure out which master cylinder to use with a four wheel disc conversion on a Civic?

The '94-'01 Integras with ABS used a 1" master cylinder, the non-ABS versions use a 15/16" one. All '90-'93 Integras used a 1" master cylinder but there were different versions for ABS and non-ABS cars.

You should use whichever version matches the brake setup you have.

One other thing: if you have the 9.5" front discs that every Civic aside from the EX came with, you want to use a master cylinder from a '92-'95 Civic Si hatch.