[datsunnazi]

if it is a Z32, it's a 1" or 1 1/16" master cylinder. it depends on the build date and such.

46010-30P01 Manufacture date 2/89 – 7/90 (17/16" NA Tokico)
46010-30P02 Manufacture date 7/89 – 7/90 (17/16" TT Tokico)
46010-30P02 Manufacture date 7/90 – 2/91 (17/16" NA & TT Tokico)
46010-30P10 Manufacture date 2/89 – 7/90 (15/16" NA Nabco non-ABS)
46010-30P21 Manufacture date 2/89 – 7/90 (17/16" NA Nabco)
46010-30P22 Manufacture date 7/89 – 7/90 (17/16" TT Nabco)
46010-30P22 Manufacture date 7/90 – 2/91 (17/16" NA & TT Nabco)
46010-45P00 Manufacture date 9/91 – 9/93 (1" NA TT Tokico)
46010-45P00 Manufacture date 2/91 – 9/91 (1" NA & TT Tokico)
46010-45P20 Manufacture date 9/91 – 9/93 (1" NA & TT Nabco)
46010-45P20 Manufacture date 9/93 – Up (1" NA & TT Nabco)