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Your groove on the passenger side shaft is normal. I have a few different sets and all of the grooves for the longer output shaft are wider than the driver side shaft.
All of the Nissan VLSD units I looked up include that clip with the differential unit itself so they aren't showing a specific part number. Only the driver side shorter shaft clip has a part number.
I did however find the clip with an infiniti OEM part #38225-32W00. I can't verify this will be any different in size as I have never ordered it, but its only $1.22 and worth a shot.
The part number you ordered is the clips from an S14 with open differential shafts.
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