Walker111 - They exist. I bought one about 2 months ago. Maybe I should say that they existed 2 months ago. Try a different dealer or maybe on-line. I think it was under $10.
And for everyone wondering of 'it means it' when you run out of DEF - It does.
Pulled into a cg in Lander, Wyoming 2 weeks ago and the owner asked me if I saw the truck on the flatbed heading down the road. I didn't, just missed it. The story was that the guy was pulling his 5th wheel across Wyoming with a new truck and just totally ignored all the warnings that showed up on the info panel. Apparently he thought it was no big deal to run out of DEF and just refill when he felt like it. So the truck finally went into limp mode/stalled (she did not know those details) along a 2 lane Hwy in Wyoming. They finally got a tow truck to come out and get them. The tow dropped the 5th wheel at the cg I was at and I thought she said the truck had to go to a dealer for something to be reset.
Tim