Yes there are two types. One piece style and two piece style. The two piece style is better. You can shim the two peice style for perfect clearance. Aftermarket bearings always come with the one piece center. So you will have to buy two sets to get 5 bearings for the rebuild.
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want a piece of the yellow car? (buy it)
you have to beat the blue car first
and then you have to take on the IV
my favorite quote
"if the solution is simple, God is answering"