the factory location for the battery on the newer Silverados is on the left side, and since I had the factory harness from a Silverado, I decided to move the battery location to the left side. So being the cheap ass that I am, couldn't see dropping 50 bucks for one out of the catalog. so I made my own.
went to the salvage yard and grab a tray from a 94 chevy or something like that for $5. I then cut the mounting tab off of the side and moved it to the rear of the tray
then cut a pie section out, so it would form around the inner fender, and I could bolt it from the underside for support. then welded in a piece of metal.
told you my welds are ugly, but no one will see it where this is going
ran it through the blast cabinet and then shot some paint on it.
drilled the holes in the fender well and the core support, as you can see i drilled one to many
bolted it up and then hook the cables up,
wish I had a side post battery, only but you work with what you got.