It seems to be an issue with the EX style kits Hesh, mine was the same to a lesser degree I managed to squeeze a very thin Gibson original pup ring in there, but it looks like that is not an option for yours.

You can either trim the end of the neck/fetboard to give you the room, or direct mount the PUPs. Direct mounting is a bit of a fiddle but it can bring great results and a very clean and stripped down look ( refer wazkelly’s EX-1 and EX-5 builds).

For a first guitar, I’d suggest ditch the PUP rings and hit Wazkelly up for some advice.

If you want to get a little crazy FrankenLab style, measure up how much you need to take from the end of the fretboard and trim that back down to the neck tenon. If anyone asks, Igor made you do it🤪😉.