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Old 01-14-2023, 02:09 PM   #7
GXP08jrf
 
Drives: 2016 1LT 'Vert
Join Date: Feb 2022
Location: Midwest
Posts: 172
It's presumably a press fit cap to protect the bearing seal.

Rear with the splines is on the right in the image, front with the seal is on the left. Otherwise thay're nearly identical. Images snipped from the web.
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