Does anybody know what the after market filter numbers are for the AD 100??

i use fleetguard FF5613 on my AD150

Yeap I'm running the very same filter on my truck... http://mopar.mopar1973man.com/personal/2002/airdog-150/airdog-150.htm (bottom of the page)

When replacing the AD filters the ones you want to use are the FF5613 (5um and best available), and you want to switch the f/w sep to a Luberfiner LFF9594 (75% emulsified/95% free @ 90GPH)The OE AD f/w sep is only 50% free water sep and 0% emulsified water sep at 20GPH. Stock is 95% free and 95% emulsified water sep.

i went to the local Cummins Southern Plains‎. they didn't stock that filter, so i had to buy the whole case(of 12) once they arrived from Huston, TX. it broke down to about $11.33 a filter.

I got mine through Diesel Manor for about $9 bucks a filter...