I don't want to put down the other rear mount turbo guys, but their pumps. This is a place I was referred to that has different pumps: Gear Pumps AC/DC Oil / Fuel Transfer
Hope this helps.
Maybe I'm missing something here, but that is the EXACT pump that the STS kit uses. I had one on my truck for 2 1/2 years before I sold it and now it's on another truck and still running strong. I put 40+k miles on it.