I got mine direct from Borg, but I only got the set for the rear duallys. for the front tires I just had the local tire shop who did the Borg install (that also deals in truck tires) add standard metal valve stems. I, too, discovered that I could have gotten the Borg Dually Valve Stems thru Camping World for less money, surprisingly, but it was after the fact. You will need to know the chassis manufacturer (for the wheels), not just the wheel sizes. ST
Two and a Hound in a 2015 Prism "B+", pushed by a 2009 Suby Forester.
1st 50 done, working on the 2nd pass! Somewhere over 150k miles to date
2005-2015 Roadtrek 190P, 1993-2005 Northstar Soft-Side TC, 1989-1993 Tents!