92-93 Si had 13/16", 94-95 civic Si has 7/8. No 5th gen civic to my knowledge had a 15/16" MC and NO abs/. I don't think you got ripped off, I think you just didn't research properly. If it was 15/16, it would've had to have abs, and you'd need to bend/reflare lines regardless.

The best thing to get would be either the 15/16 MC/Booster from a 94+ teg RS, which bolts right up, or the MC from a 90-91 civic EX sedan, which was 15/16" and bolts up to your stock booster.

You didn't get taken man, you just didn't order right basically.