TST 507RV Tire pressure monitor with metal valve stems
I bought mine at Advance Auto Parts. They fit both size holes depending on the gasket you use. They were in a 2pk for about $5 bucks.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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