I pass the Cummins Baltimore store every day going to and from work, and I still order from Jeff. A phone call and he knows what I need without needing tons of information like ESN, part #, etc. Jeff has spent countless hours on the phone with me and many other forum members trying to diagnose a stubborn problem, it is the least I can do to buy my parts from him directly.
If you have an inside at Cummins then I guess you just need an ESN, which would be much easier for someone to provide than the part #'s needed for this installation. Besides, you posted this in his vendor forum, when you could have just as easily asked for an ESN anywhere.