if you want to replace it then i would suggest removing it and finding out for yourself which one you need.So I’m looking to replace the nut on my new Classic Vibe 60s Tele. Slots, especially low e, cut way too deep. Do I need a flat bottom nut or curved bottom? Thanks. Steve.
+1if just the low e is cut too deep theres easy ways to fix that other than replacement.
if multiple string slots are cut too deep, then just take the nut out, and put a couple layers of tape on the bottom of the nut, trim around the edges and then stick it back in.
I've done this on two strats and an acoustic guitar bridge. Its worked for me.
I'll say it... this is the MacGyver solution, however! If it's stupid but it works, it ain't stupid!
My OCD wouldn't allow me to do this, every time I thought about the guitar, the fact I had a piece of tape, of all things! serving as a shim, would make me forever feel bad with myself (not too far off how this sort of janky things do affect me), but it should be fine. It won't be a slice of paper that'll suck all the tone and life out of the instrument, though I'd still prefer a new nut made.