Secure bracket arms to braces using Discount Strut Accessories Electro-Galvanized Deep Bracket Brace Adapter for 1-5/8" x 3-1/4" Struts. The electro-galvanized coating is best for indoor, dry settings. For use with W150, W201 or W211. Secure Bracket Arm to brace using W2-8 & W7409. Do not use thru bolt in bracket W5650 or W5651.