I have an S14 (Non-abs) 15/16" (Nabco) Brake Master Cylinder. It worked perfectly fine when it was in my car… I’m not sure if the S13 one is actually different or not, but I’m sure this one would work just fine…
i just want to add/change that i’m also looking to get a 300zx master cylinder (17/16") NON ABS. i’d most likely go with a brand new z32 MC so if anyone can get them for a good price, plz let me kno. thanks.