Window in Pod Door

I installed a porthole window in my Pod Door.  Make sure that you order a window of the correct thickness.  The Pod door consists of two thin aluminum sheets with a couple of inches of 'styrofoam' insulation between. I used a portable rechargeable jig saw with a fine-toothed saw for a clean cut. The cut has to be very perpendicular to the door to have a correct cut on both the inside and outside panels. My window did not come with installation putty...which I bought from a local RV dealer. I placed the window slightly higher than normal...I can still peek out along the lower half...but a visitor standing on the upper step cannot see inside.

We are getting ready to install the window for the door on our RPod. We have misplaced the screws. Amazon says they are stainless steel mounting screws but doesn't say what size. Does anyone know?