Buddy Seat Identification

[craig (DE)]

I have a buddy seat with an April 1965 date stamp. Would this seat be used for the 1966 model years?
I'm not sure when the cutoff date was for 65' model seats.

H-D-Seat-1965-1.jpgH-D-Seat-1965-2-re.jpgH-D-Seat-1965-5-re.jpg