I am not giving you a hard time, your work is fantastic, and your work ethic, and fabrication skills are second to none. I was going for being witty. For some reason West Coast Macks are built differently than east coast macks. Just visited a guy who has i would guess 30 b model macks, and of the 30 he pointed out the B75 or 73 that came factory with a cummins, as being a rare beast.
Mack is the only Manufacturer that made there own engines, transmissions, and drive trains and manufactured items down to there own spokes and axles. Mack is the major manufacturer of trucks in New England, and a Mack without Dayton wheels until recent is rare. Guys around here think the Mack 12 speed is the best transmission ever made and why anyone would use any other is crazy, had one customer talk about removing his 18 speed to install a 12 speed.
Carry on with the fantastic work, you are obviously at the top of your craft.