Reproduction black plastic clip that goes onto the lower center of the firewall of any 1969 Mercury Cougar or Ford Mustang. We have found this to be one of three possible clips on the nail heads for the firewall for attaching wiring or speedometer cables. By far and away the most common clip is the one that looks like black plastic plumbers tape Ford part number 374320-S. This particular clip is the least common. There is a third clip that is only found on 1969 and 1970 cars.