An update to close this out. Appreciate everyone's comments. I ended up going with short EPDM (Ozone resistant) rubber stems (TR412) after some research and talking with my tire installer who has a strong reputation with local car enthusiasts. I ended up having to drill out my aluminum valve stems on two of the rims as the aluminum mounting nuts were seized on the aluminum valve stems. I was surprised by how small and thin the rubber seal was in this type of stem. One of my other stems was actually heavy chromed metal version with an additional outside washer which was probably put on by the retail tire shop I went to years ago. I know there's some debate on rubber vs. metal valve stems and each have their pros/cons. (Some good videos on valve stems: short video and long video from Konig wheels). Rubber was highly recommended by my shop, and I like the simplicity of one part with some flex. I don't drive triple digits in my Pantera any longer and I run BF Goodrich Radial T/As on my Campy 8's and 10's so I felt the rubber stems are the best fit for my application. I'll end up replacing my tires in about 6 years due to age and will replace the stems as well at that time.
Now on to an alignment with the new tires and after replacing my steering rack boots, one of which was leaking.