When I had the G614's installed last month in Arizona, the Big-O didn't have the stems, even though I specifically told them I required them when I ordered the tires. Went to pick them up the next day and they had regular rubber stems installed. After about two hours, they finally found some, though they were too short to put the TST sensors on. I just got a set I ordered online from Ebay which are longer and will allow the use of the sensors. Just have to get them changed out.
http://www.ebay.com/itm/FLUSH-MOUNT-...c5aee8&vxp=mtr