belt replacement

I plan to replace the drive belt and pulleys on my dryer using a kit like #439-2065. I am wondering if while I have the dryer apart I should also replace either the front bearing/seal (340-6129) or front support bearing (279441). I am not sure which parts help support the front of the drum, and I do not know if these parts wear much. Do you recomend replacing them at the same time?