hi. Need help with my mtd heir 5 bass neck pickup. I have an old one made in korea. Im thinking of upgrading the pickups, but not sure what model for the neck pickup to look for... (Neck will be having nordstrand mm5.2) I know the old models have an odd measurements... Any suggestion? Dont really wanna do some routing on my bass... Would changing and rewinding the pickups improve the sound? Thanks so much!!!