ASD ROMSEY

I have an 03 plate Mk 2 galaxy. My 4yr old daughter shoved the cd magazine into the cd changer upsidedown and it no longer works!!! I cannot get a new one from Ford (obselete) but there are loads on e-bay secondhand. I bought one which did not work. I am unsure if that was someone selling a dud or a compatibility issue. Does anyone know how interchangable these changers are or do I need to find an exact match on the part number. Hendy Ford mechanics said most would fit OK but an autoelectrical firm said they need to match? Am confused. My head unit is a FORD 5000 rds and my changer is a 95VW-18C849-BA. Any help would be most welcome or any other ways to get some cd's playing again, ta[/font]