Secure bracket arms to braces using Discount Strut Accessories Electro-Galvanized Shallow Bracket Brace Adapter for 1-5/8" x 1-5/8" Struts. The electro-galvanized coating is best for indoor, dry settings. For use with W200, W210, W401 or W501. Secure Bracket Arm to brace using W2-8 & W7409. Do not use thru bolt in bracket W5650 or W5651.