Generally +/-10% of the rating is considered ok, otherwise replace. Residential HVAC industry commonly uses 370VAC caps on blower motors, these are oil-filled and usually oval in shape. I’ve seen motors start well outside of the 10% range but they usually don’t get to full RPM. Zero Uf=no start.
This similar to what you have?
https://www.homedepot.com/p/Packard-370-Volt-7-5-MFD-Motor-Run-Oval-Capacitor-TOC7-5/204417183
Checking back in 1 more time...
That’s close but physically too big.
Closest I’ve found so far:
It is a little bigger than the orig, and polyester vs. oil filled “something” for the orig cap, but I think it’ll squeeze in.
I may break apart the old one when I get back home.