Mayfair/ Johnson still make aerators like you have with the cartridge. You will however have to buy the whole unit and plumb it through your transom if that is what you have. They have a straight through or a 90 degree unit. Amazon has them along with BPS. I would take your broken aerator out and go to BPS to match it up. Make sure you get the correct intake size to match your current transom hole and make sure you get the correct intake size that matches your existing plumbing line.
"Practice, practice and more practice, and if you think you're good practice some more". circa 2006, Cadman