Well, erm.. I could lie and say I have a 10.5R, but I haven't.
I have a Velocity 3.5R and an Orion 4.5R. They were cheap on ebay. I don't think the Novak Lights were out when I got them. I do like the sound of the 5.5L though, but I'll see how I get on with the ones I have. I've ran the 3.5R outside and it seemed fine, but there wasn't much traction. I was fast as hell though, which I liked.
I've seen some rear hub carriers on ebay, but it doesn't look like the spacers are included.....
S.