While your searching around, check out the different brands and prices at ROCK AUTO (one of the stores in the Vendors part of the forum). Here's a link to the 2001 belt tensioners.
2001 CHRYSLER PT CRUISER Belt Tensioner
I bought all my parts from them to do the timing belt, water pump, serpentine, alternator belt and tensioner.
The tensioner that I bought for mine was from DAYCO Part #89319