Removing the footwell kick panels will give you access to the No.2 body mounts...
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The panels are easy to remove being secured with single screw up and towards the front however the tread strips may need to be removed as well since they trap the rear of the panel.
The No 2 mounts are at the base of the birdcage 'A' post and serious corrosion here is probably an indicator of further corrosion around the windscreen frame. Some surface corrosion on the mounts is probably inevitable, but what you don't want to see is something like this....
View attachment 8727
If serious, corrosion of the windscreen frame can be seen from the outside through the sides of the screen itself.