I would think the lettering on facia/lettering/board would be the same size for all passenger cars. 292 has its original wide facia, as it has its original window configuration. The installed lettering fit the wide board just fine, but would not fit on a car with modernized windows.
After the lettering get sorted out, it needs about 10 coats of varnish on it to make it glow.
If yer gonna do it right, do it right.
PS
nice beautiful job. Somewhere in the vast number of unsorted slides are pics that I took when Russ and I journeyed to Silverton to see Craig Kumler's new acquisition. That was a long time ago......