Kick-starter nut

My kick-starter decided to fall off on me the other day. Luckily i remembered hearing a weird noise going around a turn. i went back and the kick starter was laying on the ground :cool: I lost the nut and now need to replace it. Does anyone know what size nut it is?
I was going to buy the 259 pc fastener kit on ebay. I asked the seller if he knew if the nut was included and he didn't.