A Homelite bar may work, they and Ryobi are owned by the same company. Try the Oregon A041 bar mount.

Try Wally, you can get both the bar and chain there for short money.

So who or where is Wally?

I think he means Walmart. I've seen a few 14 inch bars at Sears, Homedepot, Lowes as well. Since th Homedepot sells ryobi products, I'd start there first. On the back of the packaging, it list the saws they fit.