Aeroplan: I can only see ET Y seats
United: I do not see ANY ET awards seats
ANA: I see both ET Y and J seats.

I called Aeroplan and asked the rep to check for ET J seats, and as expected she said there was no availability, I then mentioned that I am also an ANA member, and I can see and book ET J seats at the ANA website. But before I could escalate to ask for a supervisor to do a direct booking, she said that others have been asking about this and had been instructed to inform me that UNLESS it shows up on Aeroplan's systems, they can NOT book ET J for me. She was very curt and blunt, so I didn't push for a supervisor.

I haven't called back to try with another rep yet.