In 1965 the GS was an option on styles 44427, 44437, and 44467. In 1966 the GS became its own series (44607, 44617, 44667). In 1965 Fremont cars don't have the option codes on the trim tag, so if the car serial number and engine serial number match there is a good chance it is a GS if the engine is a 401.
http://www.teambuick.com/reference/years/65.php
http://www.teambuick.com/reference/years/66.php
Post a picture of the trim tag. Since it is a Fremont car the 30010 at the bottom of the tag is a batch or sequence number (not an option code even though it is stamped on the same line as ACC.) and doesn't decode, but should also be found on the build sheet.
Sean Smith
BCA# 42746
MBCC# 2122
SAH# 4186
Buickman Award 2015
1957 Special 4-door Riviera (hardtop) model 43
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