These are like rocking horse poo, to my knowledge they have never been available officially, only on selct new frames. In the past I've managed to get my hands on about 6, I've just got another. It's the entire gubbins to run a bolt thru rear wheel (except the hub) on a Meta or Supreme: Drops outs with threaded non drive side, Maxel axle and lever, re-enforced drive side drop out. Looks like this:

In the past when I've got my hands on these they have sold really fast, I've just put them live on my website again, if you want it get it ordered fast.
http://www.realcycles.com/products.php?plid=m24b0s211p1343&z=962Regards
Steve