Brake Master/Resevoir

I broke the brake master cylinder cover while trying to remove it and wanted to know if anyone knew what other bikes have similarly sized covers. I'd rather not have to purchase a whole new assembly.

Forgot to say what the bike is. 79' KZ400H. It's got the square type instead of the weird trapezoidal one.

If it's the one in the diagram above Kawasaki.com says it was used on the following:

KZ1000-C4 (Police 1000) (1981)
KZ1000-E1 (Shaft) (1979)
KZ1000-E2 (Shaft) (1980)
KZ1000-G1 (Classic) (1980)
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-P2 (Police 1000) (1983)
KZ1000-P3 (Police 1000) (1984)
KZ1000-P4 (Police 1000) (1985)
KZ1000-P5 (Police 1000) (1986)
KZ1000-P6 (Police 1000) (1987)
KZ1000-P7 (Police 1000) (1988)
KZ1000-P8 (Police 1000) (1989)
KZ1000-P9 (Police 1000) (1990)
KZ1100-A1 (Shaft) (1981)
KZ1100-A2 (Shaft) (1982)
KZ1100-A3 (Shaft) (1983)
KZ1100-B1 (GPz) (1981)
KZ305-A1 (CSR) (1981)
KZ305-A2 (CSR) (1982)
KZ305-B1 (CSR Belt) (1982)
KZ305-B2 (LTD) (1987)
KZ305-B3 (LTD) (1988)
KZ400-H1 (1979)
KZ440-A1 (LTD) (1980)
KZ440-A2 (LTD) (1981)
KZ440-A3 (LTD) (1982)
KZ440-A4 (LTD) (1983)
KZ440-D1 (LTD Belt) (1980)
KZ440-D2 (LTD Belt) (1981)
KZ440-D3 (LTD Belt) (1981)
KZ440-D4 (LTD Belt) (1982)
KZ440-D5 (LTD Belt) (1983)
KZ440-G1 (1982)
KZ550-A1 (1980)
KZ550-A2 (1981)
KZ550-A3 (1982)
KZ550-A4 (1983)
KZ550-C1 (LTD) (1980)
KZ550-C2 (LTD) (1981)
KZ550-C3 (LTD) (1982)
KZ550-C4 (LTD) (1983)
KZ550-D1 (GPz) (1981)
KZ650-E1 (LTD) (1980)
KZ650-F1 (1980)
KZ650-H1 (CSR) (1981)
KZ650-H2 (CSR) (1982)
KZ650-H3 (CSR) (1983)
KZ750-E1 (1980)
KZ750-E2 (1981)
KZ750-E3 (1982)
KZ750-G1 (LTD II) (1980)
KZ750-H1 (LTD) (1980)
KZ750-H2 (LTD) (1981)
KZ750-H3 (LTD) (1982)
KZ750-H4 (LTD) (1983)
KZ750-M1 (CSR Twin) (1982)

Thank you for the help. I was kinda hoping to find a nice aftermarket cover, but ended up getting a whole new master off ebay. $53 for NOS.