6 1/2″ Aluminum I Beam Sold By The Foot. SKU: 217 Category: Crossmembers **Price Is Per Foot** Related products 4 1/2″ Aluminum I Beam Call For Price Part #:215 Sold By The Foot. 3″ X 3″ Straight Crossmember Aluminum Under 58″ Call For Price Part #:4223 Any Crossmember Under 58" Long. 3″ X 3″ Straight Crossmember Aluminum Over 58″ Call For Price Part #:1184 Any Crossmember Over 58" Long. Aluminum “V” Crossbar Call For Price Part #:1183 Fits Up To A 82" Wide Frame Width.