FX-1 Wiseco piston install question

I am installing wiseco pistons in my 61x motor. My question is this, when I pulled the stock pistons they had small washers on the outsides of the wrist pin bearing. My piston kit didnt come with any of these. Are they necessary to install with the wisecos? I just want to make sure before I put it all back together.

Thanks
AJ
 
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