I have a similar problem with a Mighty Mite trans black quilt maple P-bass body and a Mighty Mite white pearloid pickguard. The parts were purchased from an eBay Mighty Mite dealer. Unfortunately, the pickguard tail doesn't cover the control rout (see photo). I've since found that the pickguard is the correct size for a Fender American P-bass (11-3/4" from the necck pocket to the tail), and the body rout is too long. I received a refund from the eBay dealer for the pickguard. I contacted Mighty Mite several times about the issue by phone and email without any return messages. On our last conversation, MM said they would send a "Korean"-sized pickguard that would fit. That was almost two weeks ago, and no pickguard. Not thrilled with the customer service, or the prospect of paying 4x for a custom pickguard. I'll update when I have new info...
Looks like you're having the opposite problem from what I had. The 14-screw MM pickguard should fit those older style Mighty Mite bodies. The control panel part extends a little longer & wider, and doesn't curl upwards as hard, compared with the 13-screw pickguards.
for reference if anyone else runs into this problem with Mighty Mite P-bass bodies & their corresponding pickguards:
Older P bass body with narrow wire channel routing, 14-screw pickguards:
MM5700 - Black/White/Black
MM5701 - White/Black/White
MM5702 - Tortoise Shell
MM5906BK - Pearloid Black
MM5706W - Pearloid White
Newer P bass body with wide wire channel routing, 13-screw pickguards:
MM5700US - White/Black/White
MM5701US - Black/White/Black
MM5702US - Tortoise Shell
MM5906USBK - Pearloid Black
MM5906USW - Pearloid White
*I might have the B/W/B and W/B/W parts numbers reversed on the US models, as sellers' listings & mighty mites price list seem to differ on which is which.