hi i have a part # 007 545 07 32 ecm for an 1989 500 sel greymarket, this car was built for the president of mercedes in 88 and all i need is this part to have the car in perfect condition again. ive already made numorus calls to LA, TN, GA, FL, CA, and every junkyard in lower AL, and i havent been able to find this speciffic part my question is, is there an interchangable ecm for this car: because things are starting to look grim,thanks in advance.