Sound advice: Never do anything to a convertible top mechanism without the factory service manual. Diagrams, pictures and instructions are a must for adjusting & repairs. (If you already own a Fisher Body Service Manual, do not buy this. This same info can be found there.) YEARS AND MODELS COVERED: 1971, 1972, 1973 1974, 1975, 1976, BUICK LESABRE AND CENTURION, CADILLAC ELDORADO, CHEVROLET IMPALA AND CAPRICE, OLDS DELTA 88 ROYALE, PONTIAC CATALINA AND GRANVILLE