3″ X 3″ Straight Crossmember Aluminum 58″ 4 1/2″ Aluminum I Beam has been added to your order form. Checkout View Order Form $97.95 Any Crossmember Over 58″ Long. 3" X 3" Straight Crossmember Aluminum 58" quantity Add To Order Form SKU: 4223 Category: Crossmembers Related products 5 1/2″ Aluminum I Beam $23.95 Part #:216 Sold By The Foot. Add To Order Form 10″ Aluminum I Beam $76.95 Part #:4812 Sold By The Foot. Add To Order Form 4 1/2″ Aluminum I Beam $19.95 Part #:215 Sold By The Foot. Add To Order Form 7 1/2″ Aluminum I Beam $32.95 Part #:218 Sold By The Foot. Add To Order Form