The large pulley in the photo is marked GM 3790356. From the face of the pulley to the back edge is a little over two and three-quarter inches. It's not 4 inches deep like what you need. Sorry for the bad news.

Last edited by Lugnutz; 05/10/2017 1:46 AM.
1965 Chevy C10 Shortbed 1/2-Ton Stepside
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