The T-1 Air Compressor was a part of the "cross-country" or desert kit. It was to be used with over-sized tires that you would air down under certain conditions ...and then need a quick way to air up instead of the infamous hand tire pump....no matter what color it was.
Othe parts of the kit included an adapter for the spare so that a larger tire could be mounted. Gear ratio adapter so that the larger tires would still read the correct speed on the speedo.
Herb, the chrome "F" marked cap is sitting next to me on my desk. Only one was "F" marked the other is not. I have the original style hub ends but haven't brought myself to install them...maybe if I decide to bring Frankenjeep(tm) to the national I will. I'm hesitant though since it is not being advertised as anything but a show. No trail rides and such.