3″ X 3″ Straight Crossmember Aluminum 58″ 3″ X 3″ Straight Crossmember Aluminum 76″ 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 McClain Frame To Crossbar Support $4.95 Part #:2332 Used With The 4 1/2" And 5 1/2" Tall I Beam. Add To Order Form 6 1/2″ Aluminum I Beam $26.95 Part #:217 Sold By The Foot. Add To Order Form 12″ Poly Keel Pad $15.95 Part #:1193 Fits 3" Wide Crossmembers. Add To Order Form 58″ Aluminum “V” Crossbar $107.95 Part #:4813 Fits Up To A 58" Wide Frame Width. Add To Order Form