Where to buy ac AC idler arm pulley?

Hello. ,The idler arm pulley bearing is very stiff and will not function correctly once I try to get my AC unit working. Would anyone here know where to purchase the correct replacement pulley .The car is a 1969 Dart 340 with "Air".Thanks for any help.
You mean something like this? This should fit all A Bodies.



Here's the link.

http://www.racepages.com/products/?...=mode+matchallpartial&N=7039+4294965084&Nty=1