OER Parts offers a wide selection of Seat Belt Hardware for your 1966 Mercury Monterey. OER Parts offers 1966 Mercury Monterey Seat Belt Bolt Kit, 1966 Mercury Monterey Seat Belt Anchor Bolts, 1966 Mercury Monterey Seat Belt Retractor, 1966 Mercury Monterey Seat Belt Buckle Cover, 1966 Mercury Monterey Seat Belt Retainer, 1966 Mercury Monterey Seat/Shoulder Belt Guide Escutcheon, and 1966 Mercury Monterey Seat Belt Lower Trim.