Different sizes for pinion dust/mud shield?


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I ordered a pinion drive flange kit online for the 90 diff. When I was putting it together, I found the dust/mud shield is not the right size - it's bigger.
I had done this job before but didn't realize there are 2 different mud shield sizing. Someone on YT reported similar issue, where the mud shield on left won't fit, but one on right (smaller diameter) will.

Anyone can shed light on why this is?

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