Question about c-50

[Sneeck]

I'm running a normal c-50 in my maxx, however i've just bought a special limited edition c-50, which look's awesome.

The only down side of the motor i'm buying, it's got a broken spool(pinion snapped off). Now my original plan was to use the spool of my current c-50. But since i've always been slightly consurnd about the weak 3,2 mm shaft, are there any other spool's that will fit the c-50 but with a 5mm shaft?

Also does anyone happen to know the kv rating of the c-50's?

Thank's.