Just awaiting a reply from the pitbull team on whether a Musicmaster Pickguard will even fit the guitar.
FWIW, no genuine or even aftermarket Fender parts are going to be a drop-in fit with any F-style PBG kit. It's not to say that they can't be retrofitted to work with the kit, or the kit retrofitted to accommodate the parts, but either way requires alterations to one or the other.

The DMS-1 kit is actually closer to a late model Duo-Sonic than a Musicmaster because of the two pickup configuration, the selector switch position and 24 inch scale length.