Rack & Bench Assembly?

Looking @ a rack and bench press from newyorkbarbells.com.

Im curious about the base on the power rack and bench press.

With the power racks base. Is it pre-assembled in a U shape allready, or do I bolt the 3 peices together to make the base?

Same with the bench press. Is the base of the bench press already in a T shape or do I bolt them together?

I ask because I don’t want to buy them if I cant get them to fit down the stairs into the basement?

I’ve emaild newyorkbarbells.com and havent heard back from them yet.

I would assume they are not pre assembled simply because of shipping.