I'm building up a spark 600 for my son and I'm having problems getting the rear magura MT8 caliper to clear the frame. Same problem experienced here:

Has anyone had this issue and found a solution? My only thought right now is to try and find a 160 caliper mount to see if lowering the caliper a bit will clear the chain stay. Also, if anyone has one of these laying around I'd appreciate it. Trying to get the bike wrapped up for my son's birthday party this Saturday.