Bought some spark plugs off of eBay. It appears they are not authentic. Comparison of Denso plugs and these from Nissan off of eBay tell a interesting story. The Denso plugs are all uniform and are the same exact link. The spark plugs off of eBay are longer and are not uniform as far as the tips, the L shaped thingy, and electrode. The tips where the coil packs go are darker on the Denso from eBay. The packaging is from Nissan and it looks authentic from the oness off of eBay. .Be careful, don't buy spark plugs off of eBay unless its from a verified source. These are getting sent back.