The YZ125 rod is a straight swap, it will 100% work.
This is the rod kit you want
http://www.hotrodsproducts.com/Produ...px?item_id=865. I used this kit myself in my 125.
When I pulled the engine down originally, the rod that it used was a versah with a part number that was for a YZ rod. I believe that the versah rod was the oem piece.