Hard to tell by the exterior studs look good so remove head and have a look ..Model 'A' Ford Garage ~ Model 'B' Ford Garage check this great site out may have your answers and thanks for the site.
Take a wire and ground the taillight to a good ground see if it works? if not remove cover at bottom of column to check if not full of grease or bad connections
Model "T" wrench, Model "A" has no script, thin Hex Head but A-17017 I believe same number thru out production from 1927 -31 four types were used.check the judging standards for info.