They are the original mats supplied from the dealer back in 1998 my friend, they'd lost a fair bit of their glamour when i got the car so i put them in the washing machine with some colour powder and vanish and they came out spot on.
I've seen a few sets on ebay over the years, they came in three colour schemes from what I can tell. Yellow & black (mine), red & black and blue & black. They were specific to the
cupra models also as the ones I had in the cordy were just plain black with a blue SEAT
badge. They are also a lot softer material.
If i spot any on my travels I'll grab them and offer them up to you. Sounds crazy but there's been the odd set in some at breakers yards.