Hi Mike,
These american seats are not to hard to find. I googled and got lots of leads.
It seemed that we have a kirkey dealer in the Netherlands. I'm not sure if they do the Netherlands, or Europe. I contacted them and had to tell them where I lived. They pointed out some car related businesses at about 30 km's away. The thing is: the seats come in different sizes. But what size is your ass? And do you have to take a sqeeced size (because I recon my but cheeks will be when I'm driving this thing
)
Anyway, they sent seats to them and I could fit them around my... well you get the picture. It was a good size match. So I bought them.
Michiel