I sold an HX40 off of a new 8.9 Liter Cummins or C series to a guy who changed exhaust housings and ran it on a KA24DE in a 95 240 SX and made 528 rwhp and 430 rwtq @ 30 psi and was a great street turbo. The aftermarket housing was a .63 a/r and a T3 flanged based housing made by a Bullseye performance company I think. The Dodge Ram turbo off the 5.9 B series is an HX35 which is a little smaller but has been run on MKIII's before. Talk with MDC in Indianapolis,In about this.
These are both T3 based flanges and could be bolted on with a Greddy TD06 adaptor if you can find one or make your own out of an inch thick piece of steel.
Sean