1992 Chevy Silverado UNIT ABS (COMPUTER)

The unit ABS is bad condition. The diagnostic says replace the unit. Where buy the unit used in good conditiion?

I live in Costa RIca, Central America, however I have facilities for buy in United States and Import the part, but I dont know where buy the ABS UNIT in very good condition.

I dont know if exist a "RECALL" of manufacturers for this unit.

PLease answer to my email.

Thank very much!!