I doubt your saw requires any "special" chain to fit. I've got a 450 and a 455 as beater saws. Both take .325" pitch chain. The only thing "special" in regard to fit is the chain pitch (.325"), drive thickness (.050" or .058") and number of drive links. Usually 78 links on Husqvarna 20" bar (that cuts 19") but it depends on what bar is stuck on it. Lowes is about the last place on the planet I'd be seeking parts.
Saws sold as consumer-lever saws often have odd-ball super safety chain because they worry about unskilled homeowners getting hurt. It's the first thing I get rid of when I get such a saw from a chain store.
Last time I was looking for a chain at Lowes - they didn't even list them by chain pitch. They had some silly color system.