I'm planning on replacing our exterior door. It's drafty and old.

Here's a crude hand drawn diagram of what I see from the inside. The door has been installed in a giant stucco opening, with plywood boards installed along the sides to make it fit.

The stucco is wrapped around a 2x4 stud opening, like so:

Here's my question. The space between the stucco is about 54". The opening between the plywood boards is 50.5". I'd really like to install the largest standard door-with-sidelight available, which is 52" wide. Can I simply remove the existing door and plywood, then install directly in the stucco opening?
Thank you for you wisdom and advice!