"Premium" firewall pad for your 67 - 68 Cougar or Mustang. It's "premium" in the sense that it's more expensive. The main difference between this and the "economy" version is that it has a layer of foil inside, which helps with heat insulation. However, the total thickness is actually a little less than the economy version. This may make it easier to install, along with the included hard plastic clips (unlike the rubber originals). Given the significant difference in price for negligible improvement, we'd actually recommend you buy the economy version instead.