4 1/2″ Aluminum I Beam Sold By The Foot. SKU: 215 Category: Crossmembers **Price Is Per Foot** Related products 3″ X 3″ Straight Crossmember Aluminum Over 58″ Call For Price Part #:1184 Any Crossmember Over 58" Long. 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. 12″ Poly Keel Pad Call For Price Part #:1193 Fits 3" Wide Crossmembers. McClain Frame To Crossbar Support Call For Price Part #:2332 Used With The 4 1/2" And 5 1/2" Tall I Beam.