Hi Cain,
I dont have them yet!
There is an guy in an austrian second hand online portal, that sells his dex410, with alot of parts and i asked him, if he sells the aloy side rails separatly as well, so cross my fingers, as i'm not willing to spend arround € 50.- for one side, if i had to order them from a shop...
As for parts aviability, it is not that hard here in europe, most of the time, when i do order from my little LHS, he gets the parts within a week, or so, if he does not stock them at the moment.
i do online orders from austrian, or german shops as well, and have the parts coming in latest within two weeks, thats ok for me, as i stock quit some parts and i do not race that often too.
if i cant get those used side rails from this guy, i'll draw some and let them water Jet out of an 4 mm cf sheet...