Pretty sure the needles are the same ones used on the mounjaro pen, or you can just pick them up at a pharmacy without hassle. Didn't realize that setup with the larger vial could actually cause issues. Appreciate the heads up.
The needle tips themselves are widely sold through legitimate retailers, just search for the standard insulin pen needle terminology. Cartridges are trickier to find though, search using the standard 3ml insulin cartridge terminology instead.