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This one isn't too bad - How are the other three mounts that are under cover? I had one that was about like this - bad news was it was the best one. I would also be sure to check the rocker channels (get under the car with a good light and look above the frame) as well as the windshield posts (pull all of the covers off around the frame on the inside of your car.
Have you pulled the covers in front of the rear wheels as well as the other front cover? Also, as I mentioned check the rocker channel - under the car over the frame the bird cage goes the entire length under the doors. Hard to see but use a strong light and a screwdriver and you can see/feel around. The other major trouble spot is around the windshield - pull off the header and the side piller mouldings and you will be able to check most of it. Also at the base of the windshield pillers check where the piller meets the body - you can see a small amount with the door open.
I don't think it looks that bad. What do you think?
My #2 mounts were about the same as yours not to bad, but my #4 mount top side that fastens to the body both sides were rusted that I had to replace them. lol