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The rubber stems are just that and you can tell by looking at them. Metal ones look pretty much the same but with a metal sleeve over them. Chances are very good you have the rubber ones as the metal's are extra charge and usually people only use them on alloys. Pretty much any tire place should be able to put in the longer stems for you next time you get tires (or you could have them just swap the stems, but they might charge you for mounting and remounting the tires when all they really have to do is deflate them, compress the sidewall near the stem, swap the stems out, reinflate. Either way, they've got to charge you something). They might tell you not to use the rubber stems as the edge of the hubcaps might cut into them, but I don't know. In my experience, the metal stems are much better at holding air and are reusable, but I don't know if they come in long versions.
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