McClain Frame To Crossbar Support 105″ 3″ X 3″ Aluminum Straight Crossbar Extended Step has been added to your order form. Checkout View Order Form $4.95 Used With The 4 1/2″ And 5 1/2″ Tall I Beam. McClain Frame To Crossbar Support quantity Add To Order Form SKU: 2332 Category: Crossmembers **Works With Aluminum I Beam Trailers** Related products 8″ Aluminum I Beam $49.95 Part #:219 Sold By The Foot. Add To Order Form 3″ X 3″ Straight Crossmember Aluminum 76″ $125.95 Part #:4427 Any Crossmember Over 76" Long. Add To Order Form 82″ Aluminum “V” Crossbar $143.95 Part #:1183 Fits Up To A 82" Wide Frame Width. Add To Order Form 7 1/2″ Aluminum I Beam $32.95 Part #:218 Sold By The Foot. Add To Order Form