Careful. Conflicting information. On my 1970 280 SL the carpet on the tunnel was definitely glued down (and I believe original).
Wd's car is probably more like mine,
And, when I was taking it out for the same reason, some of the carpet stayed glued down (pulled thru the backing).
I will need to get creative in the future to fix this. But, at least I still have that patch of carpet.