If it is going to be a WORKING truck I'd follow specs but if a cruiser or show piece anything should work. Should be very easy to turn from a piece of 1" bar stock and don't worry about accurate to five places as the BUSHINGS can be honed on a Sunnen to correct clearance. One hour job. My centerless grinder went with the big shop but I still had they would be as accurate as the instrument doing the measuring.
