I've drawn up a diagram showing the dimensions of the Roadmaster Adapter Kit for Blue Ox Motorhome Mounted Tow Bars # RO64FR below. The pin holder portion of this adapter is 2-1/8" wide and 1-1/2" in diameter. view full answer...
MaxxFan does not offer a taller garnish than what comes with the MaxxFan part # MA00-07500K that you referenced but the included garnish can fit roof thicknesses that are up to 6-1/2 inches thick so you might check to see if it could fit.
If you trimmed yours down already and need a new one we have that with part # MA54FR. view full answer...