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This is a question you should pose to a salvage yard, or better yet to one of those salvage parts finder services on the web. That is a popular part for cars of this vintage, so good luck.
I presume that you have ruled out the wheel sensors and wiring and have determined that the ASC control module has failed?
BTW, the most common cause of an ASC warning light on this vintage BMW (after damaged wheel sensors) is the ASC throttle (aka Secondary Throttle) which is right next to your regular throttle. If its cable is bound, or its electrical connection is damaged, or anything (such as the throttle boot hose clamp) interferes with the action of its throttle plate, it will prevent the ASC from working.
When your ASC light is on this is to let you know your Automatic Stability Control system is switched off press the ASC button Till light is off /ASC is on this works with your rev limiter and should stabilized your idle. If the problem persists have your throttle control unit checked as thi can trigger the ASC light as well and may also activate the ABS light if not fixed