[R-390] Name Plate Screw Size?

[Barry]

I have an R390 that's missing one of the screws that holds the nameplate to the front panel.  I'm pretty sure the size for the R390A is #2-56; however, this is an R390 and appears to have #3 screws (measures about 0.097" diameter).  Does anyone know whether the R390 used #3 sizes for the nameplate or, possibly, has someone tapped the holes just a bit larger in my front panel to accommodate #3 screws?

In any case, I suppose I'm going to need a #3 to fill that hole.  Not sure if the local store where I've bought lots of small stainless-steel pan-head machine screws will have #3 but I can check.

Thanks,
Barry - N4BUQ