Three Types seem to exist in the shape of the Pick Guard.

1: Type in a light green label period( Example S/No,560XXX)Type1
2: Type from a red label period to around 1971.( Example S/No,803XXX )Type2
3: In around 1972, a top of them is thinly and becomes slightly big.( Example S/No,2021XXX)Type3

Type1 (light green label period)

Type2 (Red Label 1968-1971)

Type3 (from 1972)