Maytronics, 9980733, Dolphin, Filter and Cartridge Holder
exactly what I wanted, at the best price I found
After years of use, I dropped and broke the frame from one of my filters. This is the exact replacement and worked fine. Note that this is the FRAME ONLY. I had to remove the S-clips, the intake valve/bag, and the spring knobs from my old one and put on this. But for the $40 difference between the part and the entire assembly, I'm good with that.