These clever guides are designed to fit approximately 1970 and later BMC vehicles (MGs, Triumphs, Jaguars, etc.) that have the single-post head-rest design.
They keep your shoulder strap properly over your shoulder, and also keep your strap at the ready.
Made of tough but flexible black plastic with UV inhibitors for long life.
Installs by removing your headrest and simply sliding on for a friction fit. No tools required.