727 Rebuild Blues

STRorange said
Hi A-bods,
Old thread I know but I'm also looking for 'lip seal' info.
I've seen you can fit 71-up lip seals into pre 70 front drums.
Is this correct?
As I have a pile of 71-up rebuild stuff and very little earlier parts.
Best wishes from John

I doubt that'd work because each piston is designed with a groove that's either for the narrow seal or the wide seal