I have a 2021 Blazer NON-BOSE sound system. I couldn't find any instructions on how to get st the front dash speakers.
I am replacing the front door speakers with Rockford Fosgate P1692 Punch 6"×9", the rear doors with Rockford Fosgate P1650 Punch 6.5", and the dash corner.speakers with Rockford Fosgate P1T-S Punch 1" tweeters. The speaker brackets are Metra 82-3006 6" to 6-3/4" Speaker adapters, METRA 82-3019 6"x9" speaker adapter, and for the front corner dash Metra 82-4201 2.5" speaker to tweeter adapter. The speaker wire adapters for front & rear doors American International SH3802 speaker wiring Harness. There is no adapter for the front corner dash speakers (as of the time I replaced my speakers); but the attached file gives the color code, along with how to remove speakers and the rest of the system.
I didn't purchase any of the components or adapters from Crutchfield, but DID purchase the directions from them. They are worth the price!!!!!
I also purchased from lljcustoms.com I purchased Custom Harness: 2019-2021 GM/GMC T-harness (Without Bose) 1920GM, and having them add the Pac Lp7-2 line converter. This will give me my low-level output for my Rockford Fosgate P300-10 that I will be installing as well. This also eliminates the need to worry about the ANC, & having the chimes and other stuff at increased volume.