RB25 Trans Part?

[StruckANerve]

I got a Z32 Trans with the RB25 bellhousing that I am using for a swap in my s14 and it had the front Trans cover removed and a bunch of little pieces in a bag. It seems it is missing this stopper ring that goes on the striking rod shown in the pic. I have the small snap ring but I don't have any idea where I might be able to locate the stopper ring. Can anyone help me out?
http://i8.photobucket.com/albums/a16/newmexneon/TransFrontCover_zpsf9vjset4.jpg