Wow, glad i read all this wink I've used centrics in the past with no issue but it's been a few years (4-5?) I would say to buy locally and have them checked before use. If they're out of whack, get another set and repeat.
HMM and I just sold my brake lathe a couple of months ago as it hadn't been used for quite some.
It's like my buying stocks,They are guaranteed to plummet until i sell, then they rocket into the stratosphere LOL

Might check with a couple of the brake and clutch rebuilders if you have any nearby. Only other suggestion would be Hemmings or possibly Kanter
HEMMINGS LINKY

www.tandmautomotive-omaha.com