HPI Roto start shaft?

[SubaruWRXSTi]

Hey, I just made a trade for an RC, The person who gave me it lost the shaft for it. Are there different shaft sizes or just one size? Thanks guys, this is my first roto start.

 

[Phins Fan]

Whats the car? I know theres different types of roto starters but would imagine all the HPI starters would be the same.
http://www.ebay.com/itm/HPI-Starter...Control_Parts_Accessories&hash=item33694b14cd

Seems like a cheap investment. Even if its the wrong one

 

[alpinestars199]

All the hpi shafts are the same size