Looking at a chart I have, the Honda impeller (Sierra 18-3100) should be a six blade and measure 45 mm across, 14 mm thick and fit a 13 mm shaft. That’s about 1.8" across, 0.55" thick and 0.51" for the shaft size.
I heard years ago about using a Honda impeller but have never come across one even close to fitting the bailer motors. I’ll be going by a dealer later today so I’ll bring an old SA impeller along for comparison.