Sidecar Frame I-bolt mount for all California Sidecar frames, Friendship III, FS II SE, FS II, FS I, Companion GT, Companion. I-bolt head has 3/8" bolt hole to attach strut to. Threads are 3/4"-16 tpi. Threaded section is 3-3/8" long. I-bolt is 5-3/8" long overall. Comes with nylon lock nut. CSC OEM part # S009. This I-bolt attaches to the sidecar frame and the upper struts attach to it.