These are the 1969 and 1970 Mustang rubber heater hose grommets that fit at the firewall.
These grommets were originally installed on Mustangs in the firewall holes to seal against the heater hoses.
They also protect the hoses from damage or cutting from the metal.
These grommets are made exactly like the originals using the original Ford Blue Prints.
Sold as set of 2 for one car.