Product review (4 stars): Dryer Maintenance Kit - Must Check Compatibility
This dryer maintenance kit works with most of the Frigidaire dryers.  You can find instruction videos on YouTube which are excellent for using the replacement parts in the kit.  However, be careful.  This particular kit is for the newer style Frigidaire.  I found the tensioner pulley was not really correct for my application.  I was able to modify it by adding some spacer washers onto the mounting bolt which helped to align the pulley correctly in my application.  There is probably another kit for the older style.  I guess its my fault for not checking in more detail.