Vaughn,
It does exhist. I just replaced mine this summer. As a matter of fact my response is in the last TDR just as you said with the grommet number. MM800, get in the last TDR under 12 valve and you'll see the part number. Order from your local cummins shop, not the dodge dealer. It'll be a fraction of the cost if you get it from the big truck dealers. As a matter of fact, it was given to me by someone else who was having the same problems as I was at the same time.
WD