There is a 4, 4.7 and 5.4 searider.
The 4.7 is very hard to find. I have one but just not ready to sell it.
I know of a very good sr4 in the Nederlands.
http://www.avonsearider.nl/index.php...=195&Itemid=30
On the same site there are other SR4 for sale, but this one I've seen personally in action.