This will allow your Mac Pro 5,1 to Boot up to macOS Monterey 12 to Sequoia 15 with a preloaded boot drive using OpenCore Legacy Patcher 2.4.1. This is a preloaded boot drive created for a Mac Pro 5,1 that runs Monterey 12 up to Sequoia 15 using OpenCore - Simply plug this NEW drive in to the bay slot, boot up and your ready to go.
eBay