Wizard brand outboard made by Kiekhaefer Corporation (MERCURY). Usually private brand outboards were rebranded versions of a motor
made by major brand. In this case a motor made at the retailer's
request (per an article in Antique Outboarder) that later was upgraded
into Mercury line.
In any case your Powermatic 25 is closely related to Mercury Mark 30
so Mercury Models Prior to 1965 manual and Mercury parts should be
similar if not the same. Contact Joe Poole at Fergusson Poole in
Atlanta. A friend redid one of these and it looked great and ran
better.
Good Luck
Louis