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Thanks to Covid-19, I'll be doing my own tire mounting and balancing (I have a bubble balancer). I can source valve stems from Amazon, but I am unsure on what is the proper size. I have some 15x7 Rally's seen here and I'm putting on some cooper's 255/60/15's
I'm wondering if you meant diameter or length? (or both).
It seems like you could measure the diameter of the hole in the wheel. Length may be a matter of personal preference.