I think the WC-123 is the 3-piece cabinet for the 2330/2325/4300/4400 size models, and there is no WC-23, only a WC-24, which is the one-piece for the 2330/2325 etc.. You're looking for the WC-124, which, to my knowledge is the only case Marantz officially offered for the "big-boys" (2385, 2500, and 2600). It's also 3-piece case, with LOTS of room for the flow-through ventilation required by these high-powered models. I've seen one-piece cases for these receivers as well, but I believe they're all aftermarket.