Unfortunately we are not a parts site but if I am understanding the part that you are looking for, it is called the Alarm Module and I attached the part number below.
Also, I attached the replacement process including a website that appears to have one.
Basically you just need to do a Google search for the part number listed and this should pull up. Clearly we need to confirm this is the correct part number but you are correct that the part is no longer made by GM. However, you should be able to find one in the aftermarket as normally these companies by the inventory from GM when they discontinue it.
Please review this material below and if this is not the correct part number, can you get the number of the part that they say it needs and we will see what we can find?
Thanks
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Friday, August 6th, 2021 AT 7:58 PM