Notches, US manufactures stopped making convertibles in the mid 70s due to NTSA rules about crash safety, so they outsourced the work to "Coach" builders,
Here's a list Ford used
Coach Convertible - List of Known Coach Convertibles - Conversions of Ford Products
Conversions of Ford Products
Lincoln Continental Coupe:
AHA Manufacturing (1977–1979), Silcco (Ultima, 1977–1979), Hess & Eisenhardt (1977), California
Coach (1978)
Lincoln Continental Sedan: 4-door (Silcco, 1977–1979)
Lincoln Mark V Coupe: Emess Coach
Builders (1977–1978), Global Coach (Lucerne, 1978–1979), American Custom Coach (St Tropez, 1977–1979), Coach Builders Ltd (1977–1978), Hess & Eisenhardt (1978), L'Edition Limite' (Cabriolet, 1977–1979), Bradford Motorcars (Cabriolet, 1978)
Lincoln Mark VI Coupe: Coach Builders Ltd (1981–1983), Carelli Autoworks (1983), American Custom Coach (St Tropez, 1980–1981)
Lincoln Mark VII Coupe: Coach Builders Ltd. (1984–1989)
Lincoln Mark VIII Coupe: Coach Builders Ltd. (1993–1995)
Lincoln Versailles: Global Coach (1979)
Ford Mustang II: Emess Coach Builders (1977–1978)
Ford Thunderbird: American Custom Coachworks (1977–1979)
Mercury Cougar: American Custom Coachworks (1978–1979), Coach Builders Ltd. (1982,1984–1986,1987–1988), Car Craft (1985–1986)
Mercury Capri: AHA Manufacturing Lmtd (1979–1983), ASC McLaren (1984–1986, 552 built), Bivouac Industries (1981–1982), Classic Marketing Group (1980)
Ford Mustang: Coach Builders Ltd. (1981–1982), Steas Industries (1981–1982), Bivouac Industries (1982), Convertible Specialists Inc. (1982), National Coach Engineering (1980–1982), Intermeccanica C'abrio (1980–1982), ASC McLaren (2-seat, 1987–1990, 1,806 built), Tomaso (Swift, 1979–1980), American Convertible Corp. (
National Coach 1980), Milan Coachbuilders (1980), Elan Convertible Ltd. (1981), Silcco (1980–1981), Barrows Ent. (Compliment, 1981–1982), Grandeur Motor Co (1981), AHA Manufacturing (Pony, 1980–1983), Armbruster/Stageway (1981), Con-Tec (1981–1982), Capital Coachworks (1981), Munich Motor Works (1981), American Pullman (1981), Note: Factory convertibles built by Cars & Concepts started in 1983.
Ford Escort/Mercury Lynx: Steas Industries (1981–1982), National Coach Engineering (1981)
Ford EXP: unknown (1982)
Read more about this topic:
Coach Convertible,
List of Known Coach Convertibles