Vantech Side Support Galvanized Then Dipped in Rubber for A285 (4 Pack) Side supports are Galvanized then dipped in rubber for durability. Includes stainless steel mounting hardware. Side support prevents item from sliding off the sides. Package contains 4 x A04 Side Supports with Hardware. Installs ONLY onto Vantech A285 cross bars with 1/4" button head allen bolts. Vantech A285 crossbar dimension: 2.25" x 1"