adding a 2nd battery in a 2000 silverado

[Guinelle1 10+ year member]

i have a 2000 silverado and im looking to add a 2nd battery. i cant seem to find the part numbers for the tray and the clamp and stuff. ive found them where people are adding a battery where my stock battery is but i want to add my battery on the passenger side above the coolant resevoir. also how do i go about wiring it up? i plan to just wire in parallel so just one positive from the main battery to the aux battery and then ground the 2nd battery to the frame?

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