Thanks so much Frank, the first response!
I don't know why no one touches these seats? If you know how it work it is actually not that difficult. Very different compared to any other job on these old cars. Of course in my case I needed to change the padding and this a bit more tricky. Overall I am very happy with the result and I think the rest of seats are easier to do, now as I know how it works. I might not have mentioned this:The summer heat is a big help to make the leather softer and stretchier.

Best, Martin