justr to pugt your minds at ease.
with my recent brake master thread. ive fitted a 1980 patrol master. (completly diferant style and about 20mm longer) to mine no dramas.
s15, bolt on
and im curantly using a gu patrol master. 1/1/16 with no proportioning valve(im running a wilwood bias valve)
if its a nissan and rwd and r/h/d it will fit.
common sizes are 7/8,15/16,1,1.1/16. inches.
only isssue is the proportioning valves are all diferant. for example the s14 one reduces by 20% to rear barakes. z32 by 40% so you will find unless you put the s15 valve in the rears wont work as hard and you will cook the fronts.