Well if you head over to:
http://www.nortechracing.com/
The axle pins are back in stock there. The sizes are:
"Front" -
9.5mm - these fit 4wd front hexes
"Rear" -
11mm - these fit AE, Losi, Tamiya, JC rear wheels
"Cat SX" -
12.7mm - these fit Cat SX front and rear wheels
and fit in AE and Losi wheels also.
I use the Cat SX pins in my rear wheels. They are a little too long for JC wheels but can be trimmed. They are also perfect for SC10 wheels to help stop them stripping.