5 1/2″ Aluminum I Beam Sold By The Foot. SKU: 216 Category: Crossmembers **Price Is Per Foot** Related products 12″ Poly Keel Pad Call For Price Part #:1193 Fits 3" Wide Crossmembers. Aluminum Welded Crossmember Call For Price Part #:1186 Please Provide Boat Make And Model When Placing The Order. 3 Bar Light Is Extra. 8″ Aluminum I Beam Call For Price Part #:219 Sold By The Foot. Aluminum Straight Crossbar Extended Step Call For Price Part #:3608 Extends Past The Frame For Extra Fender Support. One Front And One Rear Of The Fender. Up To 105" Long.