Yes that definitely does help - I measured my power steer pulley at 150mm (6 inches) because its easy to measure! and then applied a ratio of a printed version of your photo to see what dimension the idler is - and sure enough I calculate the idler pulley at 61mm give or take.
It also appears that the pulley would have to be ribbed to run on the inside of the serpentine belt..
Which all leads me to believe that the parts people may have it wrong. If you have time could you possibly give me an opinion on that - check rockauto.com - I use the 1996 Contour LX 2.5L - and under accessory belt it quotes 3 parts - Four Seasons #45975 (which I got), Delco #38001 and Delco #1520679 - now the 2 with 'more info' show photos which look like the one I have received
http://i43.photobucket.com/albums/e367/kiwiford/IMG_3969x.jpgI also checked on autozone.com - they show a similar part AC Parts 45975 which is the same as at rockauto. I'd appreciate a steer in the right direction to get the correct part from a USA supplier!!
Many thanks
Malcolm
