They have a few different sizes available. Just measure your ceiling clearance first. The motor sits pretty flush, but you still need enough drop distance.

Wait, they told you they stopped carrying it years ago but you were just there last month? How does that even work, did you walk into a time warp? That's the kind of thing that makes you wonder what else they just decided not to tell people about. It's like these places forget that the old ways still work perfectly fine.

The banana trick works because the starch swells to seal small leaks.