Here's my second shot. I went to the web site, and picked up a photo (same as you have given). I tried to measure the length of the flat region of the outer can---this is where the magnets fit. I get about 1" (since the motor is 2"long and nominally it looks like a actual size drawing on my screen. 1" is 25.4mm, so I can believe the magnets are in the 26mm range (which is where the "26" in the AXI and Scorpion designations come from. The magnet length is also the nominal iron stator length, so so far.
Since the kV here is 800 rpm/Volt, I'd pick out the closest version in the AXI 2826 or Scorpion 3026 line.
And that's how I try to mix and match motors.
Check that the 2826 AXI and 3026 Scorpion wattage/amperage specs are ballpark. However also remember that AXI tends to be pretty conservative with its max power ratings, and Rimfire more on the liberal side. I use Scorpions and have no reasons to believe their specs are far off.