Powertrain Control Module for 1992 Mazda 929 Sentia
 

I am looking for a Powertrain Control Module Engine Computer Box JE53 18881c for 1992 Mazda 929 Sentia (also called a Computer Control Box).
I searched the internet but couldn't find the part with the exact code. I enquired in scrapyards but they don't have it as the model is old. Any suggestions on where to find this part?