Bishop thanks for digging around and finding that metal pulley
The catalogue I used did not have that part number, so I recommended what was the closest to my measurements, here is the ling to that catalogue:
www.gates.com/downloads/newproductinfo.pdf
However, one thing has to be pointed out. I do not believe that pulley 38008 will damage the belts. Why do you state it in such certainty? Please elaborate.
All ribbed belts have standard dimensions that depend on the number of ribs. In this case the 25mm or 28 mm measurement is the overall width of the pulley, not the width of the area where the belt sits on. All it means is that 38008 pulley is slightly narrower on the outside, which should not cause any fit issues, but since it's still V-grooved, flanged and with 6 ribs, there should not be any damage caused to the belts, or premature wear.
Keep in mind that I said "should", as I have no personal experience with this pulley, I went with Dayco since it was easier to find.
This metal pulley is a great find and I will try to get my hands on it. As I elaborated earlier, I believe that the weak bearing dust shields, that cause loss of grease, are the cause of squeaking, but with a plastic pulley the bearing cannot be changed to a better model. With this metal pulley, the bearing can easily be pressed out and a new one pressed in.
Also, does anybody know how to edit the original post? I would like to add the new pulley number.