you don't need to have bearings made or find some other application that is the right size though- The ground crank needs to go in the trash. It *WILL* break at your planned power levels.
This means you need a new crank. An OEM one which has 52mm journals. This means you need to get new rods, and there's only about one place that keeps aftermarket ez30 rods in stock and they're meant to be used with standard subaru acl bearings. Or you can just have them made yourself.