PRT shocks are engineered to match OE mounting dimensions, compressed length, extended length, and mount types (loop-to-loop or bolt-to-loop) for the specific application. No bracket modification is required for a direct swap.

Gas-charged shocks use pressurized nitrogen to prevent cavitation (air mixing into the hydraulic fluid under hard use). This keeps damping force consistent during repeated compression cycles and reduces fade on rough roads or towing duty.

Air-adjustable shocks are designed for vehicles with factory air-assist or load-leveling rear suspension — typically trucks and full-size SUVs that tow or carry variable payloads. If your vehicle left the factory with an air-ride or load-leveling system at that corner, you need the air shock; a standard gas shock will not replicate that adjustable load capacity.

It depends on the specific part number. Some PRT shocks in this lineup include a dust shield (metal) while others do not include a boot. Check the 'Boot Included' and 'Dust Shield Included' specs on the listing for your part number. If yours arrives without a boot and the OE had one, aftermarket universal dust boots can be sourced separately by rod diameter.