Rdavis, since no one seems to have a definitive response I will volunteer that my 48 Craftsman has a 3 bin , hard plastic unit(s), since new. I've never looked for not seen a pn but is the "common" looking one. I paid around $300 in 2004 from Sears. Nothing has been replaced although a few small items were damaged and replaced with my diy equivalents: Strap holding inserted "up tube" to stationary tube from deck (rubber, broke) not needed; rubber springs holding stationary tube to deck broke, replaced with home made springs. That's it. The thing has been durable. If you tell me where to look for a pn I will see if it has one. The $370 price looks likely for inflation adjusted 9 years later . The $299 likely a different unit (or a deal.) All bets off with Lowes. I have found them high.
Edit Th Checked receipt. Paid $350 not $300. Craftsman pn 71-24985