They take a while. When I had my engine rebuilt, the engine cases were taking a long time. They still make them, but I have a feeling they are on back order and it's probably a first come first served thing. Just get your order in, and the should show up within a month or so, I'd guess. I'd order them from a large parts warehouse if possible, as I'd imagine they'd get their shipment before a small mom and pop shop would, although I'm just guessing on that.
