installing "J" valve stems on outer dually E-450

Yes I had to enlarge 2 or 3 of mine. No worries can't notice
No big deal. Great upgrade.
Bob

Mine are Tireman, and I did have to enlarge some of the ovals, but not all of them.

(now that I go back and re-read the OP... mine are not tireman/borg - they are add-ons...)

Here's mine:



I can move them to any wheel I want when I rotate the tires. I just completed this task a month ago as I had a vibration develop in the front right on our last trip. I pull the wheels & haul them to the tire shop for balancing. I reinstall them where I want, and I ensure the duals are properly installed, that is, the sight hole in both wheels is lined up with the indicator in the hub, and the stems are opposite each other:



Here's my Pressure Checking Process in pictures.

Don't have your exact answer but I cut out/enlarged one or two round holes on each wheel cover on my 2004 E450 Lazy Daze. Worked fine with the Borg long valve stems. When Schwab Tires replaced my tires they got the valve stems back in properly with no issues.