7 1/2″ Aluminum I Beam Sold By The Foot. SKU: 218 Category: Crossmembers **Price Is Per Foot** Related products 5 1/2″ Aluminum I Beam Call For Price Part #:216 Sold By The Foot. 8″ Aluminum I Beam Call For Price Part #:219 Sold By The Foot. 3″ X 3″ Straight Crossmember Aluminum Over 58″ Call For Price Part #:1184 Any Crossmember Over 58" Long. Aluminum Welded Crossmember Call For Price Part #:1186 Please Provide Boat Make And Model When Placing The Order. 3 Bar Light Is Extra.