A bar from any C-Series, XP-Series, Zip, Wiz, or other large mount '60s or '70s Homelite would work fine. An XL-Series Homelite mount bar will sit on the bar studs and can be made to work with the adjuster (see below), but isn't the right bar for the saw. The tail of that bar mount isn't tapered right to ensure that the oiler slot doesn't get uncovered, and (more importantly) the chain rivets will dig into the bar plates, clutch cover, and drive case.
Looking at your pic, I'd say that was a Poulan bar made in the XL-Series Homelite bar mount pattern (Oregon D096) as many Poulans used that pattern (some with a spacer over the studs as the Poulans had 5/16" studs). A large mount Husky bar would have required you to open up the bar slot, as the Husky mount is 9mm while the Homelite studs are 3/8" (9.5mm). As I stated above, you can make the adjuster work (I have a 22" DO96 pattern bar that had been so modified), but there are other issues. Sometimes it can be made to work without a problem. You must have gotten lucky there. Still have that shorter Roller Nose bar?
