So looking at replacing my valve stem seals and notice a couple big differences between FelPro (SS72861) and GM Genuine (10212810,12564852) seals. First is that the GM Genuine exhaust and intake are separate product numbers and look different, while the FelPro set supposedly has both but they look the same in the pictures. And then there is the price, the FelPro price is way cheaper at $12 vs GM Genuine at $60+. Anyone have any opinions on these differences and if they matter?