I would start with your local Diesel injector repair shop. Ask about shops in the area that have gone out of business or that have up graded. Ask at large truck repair facilities, rental equipment centers, or Diesel engine repair cos. like Stewart and Stevenson. Check out the fuel injector trade magazines for used equipment. I understand that ebay now has a 'want to buy' section. Granted this equipment is not your run of the mill Ad Sack or Thrifty Nickel kind of item but I bet that there is some publication out there that deals in it.