I too was struggling to find the correct belt when I was doing the renovation on my 47 Custom. Here are two photos showing the Ulrich belt installed with the part number, and two other belts I tried. I believe both were narrower than the Ulrich correct belt. I may have kept one of the narrower belts to use as a spare. Hopes this helps.
IMG_0010.jpeg (90.04 KB)
IMG_0021.jpeg (37.56 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=250136