I bought a bunch of sliding pots from Mouser. They are 2" long by 1/2"
wide. At each end above the slide track they have a screw whole that has
been tapped.

I am trying to build a custom control box out of sheet styrene. I would
like to mount the pot under the styrene and have a "decorative" slot on the
top that would be screwed through the styrene and into the tapped holes
described above.

Unfortunately, mouser says they do not sell such an animal.

Does anyone know where I can buy something like this. (If need be, I could
buy new pots in combination as they only cost about $1.)