Help with an old Nitro ST-15
 

Hey guys, first post on here. Im currently rebuilding an old Tower-Hobbies (Duratrax) Nitro St-15. Im having trouble finding the hex nuts for the rear wheels. They are not the regular pin driven hexes that I have on the traxxas vehicles. These drive shafts are almost like a circle with 2 surfaces that are cut flat for the hex to stick on to. Looks like im not allowed to post links to the ones Ive been looking at, so anyone who has some please share the link here!

EDIT: I was actually just thinking I could replace the ending of the drive shaft that connects to the dog bone to a generic 1/10 scale pin driven. Could that work?
LINK TO DOG BONE SHAFT AND SHAFT ENDING IDEA.
dx.com/p/hsp-166015-universal-steel-drive-shaft-for-1-10-rc-car-black-2-pcs-208026?tc=USD&gclid=CLms-bSRv8ACFSgV7AodOBIAxQ#.VAPwH7xdWdw

Thanks.