My 1966 50MY does not have the Fuller portlights, instead having original solid bronze oval ones. I was replacing the deteriorated rubber seals starting in the master cabin. The square strips come in a roll and have a hollow center. I measured out several lengths and cut. As I went around replacing them I found to my surprise that I had several different size port holes! The largest were the seven master ports but the heads and bow ports were smaller. Don't remember about the guest cabin. I had never noticed this but it seems to me to be yet another example of Jack Hargrave's artist's eye in designing these beautiful boats. Everything in proportion.
Don't know if the Fuller ports vary. I recommend measurement!
As an aside, A. Howard Fuller, president of the eponymous Brush company, owned and raced his 56 foot sloop Gesture in many races in the 1950s. He realized the same plastic injection process used in making his brushes could be used for boating. Gesture won the Bermuda Race in 1946. Howard and his wife Dora, both age 46, were killed in Nevada in 1959 when his brand new gullwing Mercedes 300SL blew a rear Michelin tire at a high rate of speed.