I have a MSI K8N Neo Platinum motherboard and the Zalman 7000(a), I didn't want to remove the backplate, and I read that brass motherboard risers would work.
I put those on the female backplate risers, and it creates a height the same (maybe a mm shorter, so if anything you get better cpu contact) as the big risers included for use with their backplate. It keeps my junk cool just fine.