U joints on prop shafts

2009 sportsman 800 ho,
is there supposed to be a zirc in one of these holes on the U joint (front) it does not look like the zircs on A arms. Attachment 43578

on the back one there’s just 2 holes and no zirc, is it normal to have this much space? it clunks a little sometimes when i start going forward after reverse.

Attachment 43586

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