I ordered a cover from summit after looking at all the ones at the local autozone etc. because they didn't have any padding underneath. I didn't care for the one from summit either it was pretty much the same as the ones from the local auto parts store. I ended up ordering one from classic industries the part number is MT2763H and made by OER http://www.oerparts.com/products.html I am very happy with it , it is a very nice cover and runs around $140
Check your local Costco. I got one there, it's just a no name brand but very quality stuff. I've had it on my 73 outside in the California sun and it has held up great. Best of all it was about 36.00. I went back and bought another one.
I checked out California Car Covers as well as Covercraft. Neither offered a cover with mirror pockets for my 1970 Nova.
The best that Covercraft’s solution while appreciated was not not the most practical. They suggested sending me the cover, and me marking the mirror locations and mailing it back to have pockets sewn in.
Has any onerun across a high quality indoor cover for a gen 3 that has mirror pockets?