If you’d like to upgrade the OEM door speakers in your second generation (2015, 2016, 2017, 2018, 2019 and probably also the refreshed 2020 model year) GM Chevrolet Colorado truck, you’ll first have to take off the plastic interior door panels. Check out my DIY tutorial for the procedure (with the compatible replacement aftermarket speaker sizes) by clicking on the text link or thumbnail image below.
2015-2019 Chevrolet Colorado Interior Door Panel Removal Guide
Owners of the similar GMC Canyon, Chevrolet S10 (Argentina & Brazil / Brasil), Holden Colorado (Australia) and the related Isuzu D-Max may also find the DIY instructions to be helpful.