I am decoding our "new" 1966 Sportwagon and cannot find info on some of the codes. The Div. Series number is 44455FL1 which I know is a Buick Sportwagon with 2 seats, but what is the FL1? Also, under the trim code are the letters WCFR 2KX and under those numbers it reads 4F 5Y. Can anyone tell me what these codes are? Thanks.