Broke new piston ring...help.

I have several partial sets of rings. I will have to look and see if I have .040 oversize. Do you need a plain cast ring or a premium molly ring? I wouldn't worry about a different brand ring on one piston as long as you use all 3 rings from the same brand.

EDIT: Sorry, can't help. I have .020, .030, .060 open sets, but no .040