Sierra TPMS

Im looking at a set of used wheels for my Sierra 1500. Seller says the wheels have TPMS in them, but the wheels have metal stems in them and not the rubber stems like my factory wheels have. He says that they are OEM part # 15825475. Is that a correct part number for the sensors that work on my truck?

That is the correct number for a 2007 GMC Sierra. They began using TPMS sensors with rubber valve stems in 2008, so these sensors will not work with your truck.