Courtesy Nissan in Richardson TX says the part number is 77700-89914 and they run $1.60 each. They do not have them in stock but think they can order them. Too Intense provided the following info: "We have them listed in the Nissan metric size, I'll list them below for you. 25 mm = 4.25ea 35 mm = 5.45ea 40 mm = 5.65ea 55 mm = 13.95ea" Looking at a ruler, the ones I think I'm talking about are the...hmmmm...the opening in the floor pan is 1 3/4 " which looks like 45mm on the ruler, so maybe it's the 55mm plugs that would be right. I'll probably try through Courtesy first since I can pick them up when I'm in Dallas.