The new 1409 series Neu's should fit they are a standard 36mm size

That will be my next motor if I get sick of the castle

For info those that are looking for motor options

The 4600kv geared 28/45 with good foams is good for

40 mph on 2s lipo
60 mph on 3s lipo
80 mph on 4s lipo

Cheers