Quick Products RV Bumper Support Bracket Hardware Kit. The included hardware allows the standard bracket to become compatible with RV I-beam frames 6" tall or less. Requires Quick Products QP-UBSB Standard RV Bumper Support Bracket. Features of Quick Products QP-CVKBB RV Bumper Support Bracket Hardware Kit Transforms the Quick Products QP-SBSB Standard RV Bumper Support Bracket into the Quick Products QP-UBSB Universal RV Bumper Support Bracket Allows the standard bracket to become compatible with RV I-beam frames 6" tall or less Includes the following: (6) 5/16-18 x 1-3/4" Barrel Nut Spacers and (6) 5/16"-18 x 3/4" Flange Bolts Requires Quick Products QP-SBSB Standard RV Bumper Support Package Contents: Quick Products QP-CVKBB RV Bumper Support Bracket Hardware Kit Quick Products QP-CVKBB: RV Bumper Support Bracket Hardware Kit