Will a Gibson Les Paul custom pickguard fit an epiphone Les Paul custom?

yes, but you would have to drill and screw holes into your guitar. take the pickguard and place it on the body of the guitar. take a sharpie and mark the holes onto the body. drill a TINY hole to allow the screw to go in easy. after that put the pickguard on and screw in special wood screws with a screw driver manually...not with a drill. hope this helps