The PRR built around 345 X33/X33a double door boxcars starting in 1936. The difference between the X32 and X33 was the end door, which was used to load finished autos into the car.
To my knowledge, the PRR X33 car has never been produced in N scale.
I have designed an end door that can be fitted to that A end of a Fine N Scale X32 Double Door kit, which is still available on eBay or through Fine N Scale. The end door print is used to convert the car to an X33 by carefully shaving the A end allowing the print to fit into the recess, see images below.
These are home printed and depending on the interest here, I will make them available for purchase.
This last image shows a new trick I have been using to repair 3D prints and also fill gaps using printing resin. It is very thin, flows quickly into small creases, and is hardened VERY quickly using a UV pen or recycled button light from UV glue. It is easy to layer or even to fill a large hole, can be sanded smooth, and adhered to.