So i had the following setup on my truck but decided to switch over to a holley system.
https://www.lssimple.net/click-here-...-silverado-kit
If you converted your truck over to the single belt vortec accessories, they will bolt right up with these brackets. Mine currently has the alt, ac comp, and power steering pump but i am not sure how good they are. I removed the brackets and tried to make sure i kept track of all the washers and nuts but there may be a couple still needed. All of the spacers and brackets are there though. would sell for $150 plus shipping. I will try to get pictures up this afternoon.