Old Co-op aluminum boat parts.

[HownDawg]

Hi Everyone!
I am new to the forum so I hope I am posting this in the right area.
I am trying to locate a part for my old 10ft aluminum fishing boat.
More specificly, I am looking for a stern corner casting (starboard side).
I purchased the boat used last year and other than this one part, the boat needs nothing. The only info I can find on the boat itself is that it is a 10 ft. Co-op brand Sprinter. I have searched extensively on the net but cannot even find "Co-op" listed as either a manufacturer or distributor. Does anyone here have any info/links or any knowledge of these boats or any idea where I might find replacement parts? Any advise/help would greatly be appreciated.