tusq

I just bought a used Tremonti and it is currently set up with 12s in drop C. I assume the nut will need to be replaced to get back to the 9s that it originally came with. Looking for the best/easiest replacement, buy a core or tusq? Other?

Does anybody know which Black TUSQ XL nut is the closest fitting for the newer Tremonti SE Custom? (Grey/Black) I've recently picked one up and am looking to make a couple upgrades (locking tuners, tusq nut, etc). I plan to take it to my shop to have them mod it correctly, but I'd like the...