I just came across these and thought I would share with everyone. Magom RC, the guy in spain that sells the bruder conversions now has metal tracks available on his website. There is not a lot of info there yet, but the prices look better than anywhere else I have seen. I was looking at buying the K-1 attachment chain for a conversion I am planning to do, and it is more expensive than these tracks complete. I would still have to buy the treads and fab it all up. He doesnt list any info regarding the pitch etc, but it does look like a good option.
http://www.magomhrc.com/en/32-magom-hrc-metal-parts