Our Magna uses a gas spring attached to the sidewall above the door frame and also to the top right corner of the odd shaped entry door to keep it in the open position.
I replaced the spring 3 years ago using SPD Hardware online.
Our screen door frame is quite thin and flimsy.
I tried to order a replacement door from CC in 2002. They could not provide one. So it would need to be built locally if you want one.
I can provide pictures in a few days if interested.
The hinge points of the screen are interspersed with the entry door hinges on the same vertical pin.
We have decided that the major weak point in CC Affinity and Magna of that vintage were the entry door and screen.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs