Police Rear Master ???

Do you guys think that a KZ1000P Police Rear master Cylinder will work with my 77' KZ1000A?
No rebuild kit for my stock rear master ( works but still weeps fluid ) on my 77' and the Police one looks like the 2 mounting points are spaced the same. I know the brake pushrod length and brake fluid reservoir are issues that need to be addressed but at least their's a rebuild kit for them.

Any opinions or suggestions would be certainly appreciated !!!

Here's a cross reference list from kawasaki .com of the rear master cylinder-kz1000P-
what they will fit.I'm not sure what the difference is on a 77 kz1000A MC Like you already
know check your mounting holes distances and push rod lenghts.Hope this helps.
Fits
KZ1000-J1 (1981)
KZ1000-J2 (1982)
KZ1000-K1 (LTD) (1981)
KZ1000-K2 (LTD) (1982)
KZ1000-M1 (CSR) (1981)
KZ1000-M2 (CSR) (1982)
KZ1000-P1 (Police 1000) (1982)
KZ1000-P10 (Police 1000) (1991)
KZ1000-P11 (Police 1000) (1992)
KZ1000-P12 (Police 1000) (1993)
KZ1000-P13 (Police 1000) (1994)
KZ1000-P14 (Police 1000) (1995)
KZ1000-P15 (Police 1000) (1996)
KZ1000-P16 (Police 1000) (1997)
KZ1000-P17 (Police 1000) (1998)
KZ1000-P18 (Police 1000) (1999)
KZ1000-P19 (Police 1000) (2000)
KZ1000-P2 (Police 1000) (1983)
KZ1000-P20 (Police 1000) (2001)
KZ1000-P3 (Police 1000) (1984)
KZ1000-P4 (Police 1000) (1985)
KZ1000-P5 (Police 1000) (1986)
KZ1100-A3 (Shaft) (1983)
KZ1100-B1 (GPz) (1981)
KZ1100-D2 (Spectre) (1983)
KZ1100-L1 (LTD Shaft) (1983)
ZX550-A1 (GPz) (1984)
ZX550-A2 (GPz) (1985)
ZX550-A3 (GPz) (1986)

Finding a master with a bore free of pitting can be a challenge. The pushrods may vary in length but that doesn't matter since you can swap in the parts from your old master. I think the main thing is to find a master body that has the same hole spacing. Worse come to worse there are companies that will bore your old master and press in a liner.