Alf,
Are you looking for the entire kit, or just the "O-ring". Because the "O-ring" is just a solid rubber piece you cut to length. I have that material laying around in my garage.
Cool, I've never mailed anything to Switzerland..............
My spacers came from Tony Branda:
http://store.cobranda.com/smblvacospot.html
Pretty expensive. Almost as much as a pair of tall valve covers.