I bought the Alpha 2 doors. They fit great and my wife loves how easy it is to get in and out. I also bought the door liners with the pockets. They are padded and they mount to the same screw points as the door skins. I ordered the inside cloth panels after I received the doors and installed them.
I would get the whole package and do it all at the same time. I had to remove the door skins to attach the door liners again. It makes a huge difference! The seat and shoulder space, feel way more comfortable. The doors are solid and strong.
I didn’t like the way the lower bracket mounted to the floor brace with the existing screw, so I screwed the lower door bracket to the frame with a larger, self tapping screw, and that really tightened things up.
I also added the soft upper doors. Because the alpha doors are much higher than the stock hard doors, the plastic window kit, hangs lower and have enough play in them to conform to the extra width and shape of the alpha doors. The soft windows have snap rivets, so you can stretch and snap them to conform to the doors. I live in the mountains in Wyoming, and I need the buggy sealed up.