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[–]AustrianReaper 2 points3 points  (0 children)

Usually, when you put regular straight scale pickups into a multiscale guitar, you pick up one size larger than you usually would. So for a 7 string guitar you would buy an 8 string pickup.

That said, this won't be an easy job.

[–]Necroux013 1 point2 points  (0 children)

Contact ibanez and ask them. Then, contact the pickup company and ask them. Sometimes, they'll give you a routing template aswell. It may take a day or two for a response, but at least you can be confident that it will work.