Do I need new gaskets or hardware to bolt this in?

Grab fresh gaskets before you start—reusing the old ones is asking for an exhaust leak. Bolts typically stay with the vehicle, so you're usually good there. Check your service manual or inspect the flanges once you're under the van to confirm what needs replacing.

Will this affect my vehicle's emissions readiness status?

Catalytic converter replacement can trigger a check engine light until the engine computer completes its monitor cycle. Drive normally for 50–100 miles of mixed-speed driving and the system should retest itself. If the light stays on after that, have the codes pulled at a shop.

How do I know if this is the rear converter and not the front?

The rear cat sits further back in the exhaust system, downstream of the front converter. Check your service manual or look at the position under the van before ordering—the two are different parts. If you're unsure, snap a photo of the location and confirm which one you're replacing.