Tension and Idler pulley

My truck with it's 2.3L engine has riveted or pressed on pulleys. They don't unbolt from the flange.  The original Ford part numbers were: E97A-3F671-AA and F07A-8675-AA. I was able to find an aftermarket replacement part for them.

For  E97A-3F671-AA:
http://www.rockauto.com/dbphp/x,catalog,335,partnum,36155,d,acdelco_36155.html
Pulley info: (82mm x 17mm x 31mm) - Flanged, W/10mm Bushing
This is also Napa #31655

For F07A-8675-AA (MOTORCRAFT A/C DRIVE BELT IDLER PULLEY 1990-1997 Ranger)
Alternate/OEM Part Number(s): F07A8675AA, FOTZ8678D
New Motorcraft # YS196
Napa also carries the other pulley. Gates #36153, Goodyear #49120
http://www.rockauto.com/catalog/moreinfo.php?pk=1145581
Pulley size is 90mm x N/A x 26mm