1967 2 door fastback
If the ST is correct then it was assembled in St. Therese, Canada
Yellow car with Black Cloth interior
If it really is a ST canadian car not a STL (St. louis, MO) car you are in luck finding out the details on your car. Canada saved the records for their cars and you can request them from the canadian GM historical place for a modest fee. I think this is their contact info:
Be Prepared Before You Buy
If you are interested in purchasing a specific vintage GM vehicle that was originally produced or sold in Canada, you should be aware of the authenticity of the vehicle before you spend your hard-earned cash.
We can identify the low-production C.O.P.O., Z28, L78, M22, or other special interest optioned cars before you pay top dollar for a clone.
We also provide same-day call-back service for those who are contemplating making a purchase but want to make sure of what they are buying.
Call us with your Vehicle Identification (Serial) Number toll-free (in Canada) 1-888-467-6853, between 8 a.m. and 5 p.m. EASTERN Time. (Outside Canada 1-905-440-7689).
A nominal fee applies for the research service.
We can also help you with the documentation required to export your used GM vehicle to the USA or overseas, and to import a GM vehicle to Canada.