3/4 Smooth X 3/4 Smooth Bore

This gear bolted up nicely to my frame ('64 Mercury Montclair), and I was able to convert to modern power steering while maintaining the original steering column and steering wheel with the 25th Anniversary markings. To do this, you have to shorten the lower end of the steering shaft and steering column, as stated in the Borgeson literature. You also have to obtain a standard steering center link or an adapter that will thread on where the old power control valve was mounted.