Product review (5 stars): Save yourself some money
The same parts from Sears would have cost me $49.88.  I purchased this dryer new from Sears in 1986 and this is the first time that I have replaced any of these parts -- the only other repair that I have ever made was to replace the door switch.  The belt and tensioner arm/roller looked to be identical to the old parts I replaced.  Yes, the idler wheels were slightly narrower than mine (from 1986) but I wouldn't be surprised if new idlers from Sears today are also narrower.  All of the parts fit and worked great!  Everything has been back together and running for a week now and there have been no problems.  I have had no problem with the idlers getting flat spots in them -- they are running very quiet.