I am not sure but since Yorkdale fronts Dufferin St it would only have been the Dufferin bus that stopped in front of the mall just like the present Dufferin bus does. I can't imagine there being a special bus that went into the parking area. I mean its only a few minutes walk from the Dufferin bus stop to the front doors of the mall. And in the beginning Yorkdale was a much smaller mall. Yorkdale is not like Square One in Mississauga with all those buses. I know there is the Caledonia bus that would turn into Yorkdale Rd and would stop where the present Go buses are. Then when it left it travelled back out, onto Bridgeland which turns into Caledonia Rd. But I highly doubt there was a special bus, But then again the mall opened in the 60's so I don't know. Why are you interested in this?