coupes and fastbacks are different quarter panels. My 66 fastback is also 10". Also most new repro quarters may be different in size with other repro quarters.
I know I was just referring to the skin. Cool thanks for the infoI think you meant from wheel well opening to the top break in the fender line? The quarter panel can be a bit higher than that and also hard to measure on an assembled car.
'66 Coupe - 10 1/2"
'66 Convertible - 10 1/4"
I would say all 3 models would be different although they sort of look the same.