Check this response from gmcanada

Why I love corporate websites/empires with their
customer disservice departments...
I was merely asking for the towing capacity for a '93 skylark 3.3L.
begin quote:

Thank you for your e-mail.

Your request can be processed through our Vintage Department.

The information will be provided on a research basis and will include
all available information such as: option content, selling dealer,
original paint and trim, production/shipping date, production plant,
engine number, quantities of the model produced/sold in Canada,
and copies of Motor Vehicle Manufacturers specifications or sales
data as available. The information that is available depends on the
year of the vehicle.

If you are interested in a Vintage Package, you are welcome to
call 1-888-467-6853. There is a fee for this service.

Thank you for visiting our website.

(name removed here cause she's just a pee on with a job)
Internet Correspondent
www.gmcanada.com

end quote.