Roller parts for peachtree door

A quick learner from Chicago says:
I was wondering if the bottom rollers are the same as the top rollers. The tops are 84-028 as best as I can figure since one broke as I was trying to take the door off. I'm going to replace both tops with 84-075 but I was wondering if I should replace the bottoms as well.

Thanks for your help!
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Dave Sr. from SWISCO responded:
Hey, Steve. It really depends. You should check the bottom rollers just to make sure they're the same.

Usually the bottom rollers wear out first, actually, so it's definitely worth giving them a thorough once-over.
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