At one time wiseco made the super stock forged pistons by vito's.
The super stock piston has the crown lowered on the front (exhaust) side by 1mm to change the exhaust timing for more blow down time. It's like having a mild port job.
Unless someone has one of the old forged ones, just pass on the super stock piston and go with a regular wiseco piston and save your pennies for a proper port job.