Soldering
Mounts the same way as the stock pickups, no routing needed. Worth knowing this uses a different internal construction than a vintage-correct Firebird pickup, so it sounds a bit different even though it fits the same way.
Why we say this
Fits the same mounting ring and mini-humbucker route as this guitar's stock pickups, confirmed via multiple pickup-specialist forum threads. Worth noting: DiMarzio's construction here is closer to a Les Paul Deluxe style mini-humbucker (ceramic bar magnet under both bobbins) than a true vintage Firebird pickup's twin bar magnets, so it mounts identically but voices somewhat differently from a vintage-correct replacement.