I have used these mounting rings on three Strat builds (rear rout). They aligned well with Seymour Duncan single coil pups and the single coil sized humbuckers. Check your pup cavity and ensure that the outside (left/right) dimensions will leave you enough wood for the mounting holes. Its a tight fit and no room for error. I actually used the mounting ring itself as a template before routing the cavities.
The mounting holes are off cannot use these rings on my strat, The mounting holes that mount the ring to the guitar body need to be farther apart.
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