Section 9.1.3.D.1.j states "Factory replacement ppistons or their equivalent with the exception of diameter shall be used. Cast or forged equivalent pistons shall provide blah, blah, blah..."

If the factory piston in my car are cast, does that mean my replacement "equivalent" pistons shall be cast or does that mean my replacement "equivalent" pistons may be cast or forged?

Every time I read my GCR, I swear it was written by politicians...