Any chance you have a part # for that particular cutter? I have an assortment of the cutters for cutting down the guides for seals, but not the one for cutting the seats. Thanks!
I bought it from competition products, but you can find them elsewhere.
PVT4719 Spring Seat Cutting Tool, 1.550"/.630"
PVT4734 Valve Guide Arbor, 3/8" for seat cutting tools
Now this cutter will leave a slight step to the guide so make sure your locator has the right ID to match.