Yeah the 560 is the cross over for replacement from what I could come up with...the 26" rear wheel I built up for the smaller mullet was a 570...tough ass rim...Bullcrew breathing some DH back into the DH forum!
I believe those use the FR570 rims (awesome rims!), now updated as the FR560 also.
My favourites for the big bikes.
I figured those for rear and ex511 should handle duties up front if not then 560 laced for front..