I have the same problem, mine are a pass but are towards the end of thier life. You have to buy the std outrigger and cut the spring hanger off then weld the old one on. No one makes the mil 2" drop hangers. It is possible to cut the old outrigger off and leave the spring hanger in place then weld the replacment (with the hanger cut off) over the top. It depends on where the rust is. I went to a local fabricators and they quoted £100 a side so I'll get it done later this year.
Someone posted how to do it on here with pictures, search for "Ex-Army 109 New Spring fit problem"