I got this old Delta 4" belt sander from my grandfather. Seriously, this thing is old. So I was happy to find a replacement strap that fits and works. It's a little thinner than the standard belt but works just as well. I've been using it for about two months now.
I hope you can read the specs on your old belt and then search Amazon for the right part. I got my info from a photo/description web part site and it was the wrong part. We are glad that we can rely on professionals. Amazon shipping was fast and no problem with my return