KR> Mismatched brake parts

[Paul]

I just bought and installed Hegar 4 Products master cylinders. I have Matco 
Brakes. Hegar requires ATF and Matco stipulates petroleum based fluid only. Can 
I just change some parts (O rings) to solve this dilemma? 
Paul OReilly 
KR2 Stretched 
N7970K 
Derry, NH