Have the same problem on mine. I just ordered a set of solid brass ones from tireman. $135 for 6, then have to have the tires deflated, valves installed, tires re-inflated and balanced. Not sure what that will cost, but truck repair place I get my work done at said it shouldn't be too hard. Also wanted some pressure monitors installed and solid stems are a must. Tireman guy sees like a good old boy with a backyard business, but we talked for a wile on the phone and he seems to know what he's doing. Very helpful, and I should have my stems by this weekend, and installed next week.