I don’t think that nut will work at all. Unless something has changed a lot, the Pit Bull necks have a flat bottom to the nut slot.

You have a nut that is:
a) radiused at the bottom to fit a Fender ‘veneer’ board where the basic neck is radiused on top (as opposed to a ‘slab’ board like the kits have where the top of the main neck and the bottom of the board are flat) and the bottom of the fretboard also radiused to match it, and the nut slot follows that curve.
b) for a variation on that curved slot bottom where the truss rod channel is exposed and the tab on the bottom of the nut sits in that exposed channel hole.

I’ve worked on Fender necks with flat, curved and curved + notch bottomed nuts.

Try fitting that nut on a flat bottomed slot and it will only touch at the two tips and you’ll never get it glued on firmly.

I really think you’ll need to get a set of good nut files and either make your own from blanks or use them to change the slot angles so you can use a reversed R/H Fender-style nut. You’ll also find it a lot easier to get a low slot height and good action on all your guitars.