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I've got a 2001 GL2 without the factory monsoon "OPTION" anywhere on the invoice.
However I have the monsoon amp with 8-speakers.
I replaced the stock HU with an aftermarket one and lost my chimes.
I also bought a wiring harness adapter that was supposed to be universal for late model GMs and it did not fit.
PS- great idea for a thread, lots of info to be had here.
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