Will this condenser require a refrigerant flush or system evacuation before install?

Yes. Any time you open the AC system, you need to evacuate and pull a vacuum before charging. This is not a bolt-and-go part — plan for a proper AC service with recovery equipment.

Does this come with new O-rings and seals?

The condenser assembly is new, but confirm with your technician whether replacement seals come separately or need to be ordered. Don't reuse old O-rings on a new condenser.

What's the difference between this condenser and an OEM replacement?

Same mounting, same capacity, same aluminum core design. Built to the same spec as factory — just sourced and quality-checked in-house before shipping.