Flanged vs Non-flanged Idler Pulley on 2002

350xfire
Last seen
Joined
Dec 26, 2019
Thunderbird Year
2002
Wondering if the two types of idler pulleys are interchangeable? Rock Auto sells both and my logic suggests that a flanged unit would be better, but, is it?
Thanks
 
My 2005 had the smooth idler pulley and I replace with the flanged pulley have had no issues as of yet.
 
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