I haven't kept up with jet pump repair since 1972.
I've had a AA impeller/ring sitting around for years and thought I would replace the A impeller in my 18 year old Dominator.
Thought they were all the same. Turns out new AA impeller is about a quarter inch longer in the wear ring shoulder. Almost busted the housing before I noticed. Went way to far before I noticed impeller hit wear ring insulator before bottoming on shaft shoulder.
What have I got ? How can I make this work?