Poulan lawn tractor

No idea. "The quagmire" of lawn tractors seems to be that it matters not what's painted on the side. Newer ones all seem to come from China, in the past there were "several" manufacturers that got re-branded by others, and nowadays, "big box" stores sell JD's that ain't really JDs

I'd say "call around town" and see if anyone knows anything about getting parts for 'em.

It's still a lawn and not a garden tractor and that generally means smaller, lighter chassis and drive train components and transaxle. (Garden tractors, in general, have auto style bolt on rear wheels)