Since I have not got any suggestion how to remove the covers, I tried it.
Push the cover forward, in the driving direction, in line with the glass. And pray to prevent cracks.
After 5-6mm movement you can lift it. Hopefully it can help, if anyone wants to remove it.
The iron parts underneath the covers are very rusty. I do not understand why Matra did not applied better corrosion protection on small parts, because the chassis is amazing.