Roberto, I wish you hadn't showed me your seats, I can't get them out of my head.
I found a different web site it gave the proper dimensions on your seats, I called a company in California and spoke to a Gentlemen about them, he gave me a education about seats. They should work
The Cobra web site is showing them as 520mm wide at the base. Is the MKIV wider then? It is my understanding that the MK1 GT40 replicas come in around 485mm to work with so I don't see how these would work unless the MKIV is wider.
There is another thread here that I started about a seating option. It's for the Corbeau A4 which would need to be modified slightly by having the bolsters bent or removed all together to get below the 485mm mark.
IF enough people here showed interest, the salesman I conversed with said they could do this work and offer a new line. The seats are under $400 each BTW and to me, look just as nice: Corbeau: A4