I'm not aware of anyone else offering it but the pics on DrivenFab's site of the housing look like it was cast from a mold made out of play-doh. It wouldn't surprise me if they were just machining the same stock-frame housing that other BW turbos had to their own spec though. The 7163 is an older offering that most vendors stopped offering for one reason or another. You can still get them with a v-band and roll your own if you really want that turbo. Have you looked at the GT3076R kits? It's a twin scroll dual ball bearing that supports similar HP and is still widely available on the stock frame.