We were throwing away a few of these enclosures at work so I took some home. I didn't want to drill out and ruin the covers it came with for a project I probably wont finish so I created a printable version that I can modify as I please.
I don't know exactly which enclosure they are and I couldn't find them on Mouser, but if you have a box that looks like this one, it might fit. The box dimensions, without covers or rubber feet, are about 122mmx140mmx34mm, 140x34 being the face the cover mounts to. If this sounds like your box than this cover might just fit.

I uploaded both a blank cover and one with holes for my project as well as the gasket.

I printed the cover in PLA
0.16 resolution with a 0.4mm nozzle. Printed face down with 6 or so base layers and top layers for strength and only 15% infill, but its pretty forgiving. I printed 6 wall layers so I could drill out the screw holes to size as I designed them undersize for this purpose.

I printed the gasket in TPU at 0.28mm resolution. If you choose 10 or so base layers, it will print solid. I have found that a concentric pattern works best for gaskets like this using TPU.
The gasket is not necessary, it works just fine without but its there if you want it.