Got the O2 door from Don Neiser In OK, and then the STC from Ray Torres at RT Aerospace.
Don (when selling the door) said it would just slap right on...when the IA doing the install had issues, Don said it takes a lot of finessing
so, it does work, and I get TONS of compliments on having the O2 door with glass all the way down....but be prepared for some work to 'fit' it into place.
you will like it in the end.
couple of other notes -
-- if you don't want to install the wind shield part of the STC, you can do it and Ray will sign off, but that voids opening the window in flight (O2 door has a cool window that cranks out)
-- there is no 'key' lock on the door...it has a clasp that you put on a physical padlock...I use a lock that has alpha characters on it, bot you could put a basic key padlock as well.