What engine does this piston go to???

[hot70cc]

Ok i got another piston from ebay, http://cgi.ebay.com/bicycle-Motoriz...oryZ7295QQssPageNameZWDVWQQrdZ1QQcmdZViewItem. As you can see clearly that this piston is totaly different from the one that was sent to me. The one pictured on the left is what was sent to me. It can't be used due to the location of the wrist pin hole the piston comes out of the cylinder about an 1/8 inch so i know i couldn't use it, also the cutouts on the bottom of the piston are like half the size. any info on what this piston is used for let me know. Did you take notice of the piston pictured on ebay, that is the piston i needed, don't know why this one was sent to me. Thanks. Just to let you all know, i had asked him if this piston would work with the dax 70cc and it was clearly addressed to me that it would.