Our local tire shop had them They service big trucks as well as cars.I think I posted before that although the OEM stems have stamped right on them High Pressure, 80psi the tire guy said that the rubber stems are just not adequate for the job.
Rich& Helen N.Ridgeville,Ohio.
F-350SD, Lariat, V-10,4:30 Diff, tow command Long bed, Crew Cab Dually, 06 3400RL
Mor-Ryde Pin Box