Panasonic Projector Mount Where Could I Purchase A Up To A 60inch Projector Mount, Attaching To A Steel Beam?

Where could I purchase a up to a 60inch projector mount, attaching to a steel beam? - panasonic projector mount

I need a projector mount that reached 60 inches, you can connect to a steel girder. The projector is a Panasonic PT-AE700U.