I just repaired ours last night!
I purchased the screen clips on Amazon:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I tried both Home Depot and Lowes but the clips were the wrong offset and/or the wrong color.
I used 3/16" dia x 1/4 to 3/8" grip length aluminum pop rivets. It is important they are aluminum rivets with an aluminum mandrel (nails). The first rivets I used were alum body with steel nails and they crushed the plastic retainer.
Monaco used black screen retainers with 0 offset and then used a white hard nylon spacer to make it fit over the screen frame. They also used 1/8" dia rivets as their screen retainers had 1/8" holes. They then painted the spacer and rivet black.
I couldn't find the original screen reatainer in black with 1/8" holes so i used the ones above with 3/16" dia rivets.
I masked around the retainer and spray painted the rivet non-gloss black.