The KB45 motors have 30mm mounting circle and 4mm screws opposite to the normal 25mm and 3mm screw pattern that 540 sized motors have. I had to modificate the direct drive motor plate a bit to get this motor on it's place.
scarletboa: If you're planning to run your truck with 6S, then I'd rather get the
1400kv version of this motor, as this 1800kv gets pretty hot quickly.