1980 kz 440 ltd brake Master Cylinder

I need a front brake master cylinder for my 80 kz 440 the old one leaks and i cnat find a rebuild kit or they are to expensive. I was hoping some knows an alternative(other year or other bike master cylinder that could fit) or is anyone has one laying around. thanks.

Just checked the KZ site and the following bikes use the same master cylinder:

Model (15):
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)

It's not listed, but my 82 KZ750's MC is the same as my 79 kz400's so there's a possible source too.

del