Originally Posted by grumpyoldman
What dimensions did you use to make the access door? Where did you measure from or did you just eyeball it? Getting ready to do my first filter change and am not looking forward to pulling down the inner fender well.
The dimensions are 8" X 5" but if you look close at the picture you'll see that the left side is curved to the contours of the 2011 - 2014 chevy fender well. The same year GMC's have a different fender well.
I bought the door online at MADJACK
so there was no measuring. Just traced and carefully cut the hole about an inch in from the marks.
They have them for every GM truck model year.