the black motor I have is a 3 hp like yours and the white one is a 3.5 older model that is threaded and allowed me to just build one but the black one that isn't threaded I was going to get a flange for it and have robertsons torque tubes weld a pipe on with 90 degree bend, they will make anything you want and I think their prices are reasonable, they probably have the flange too? good luck