The SMA8-A had three different mobo tray backplate variants (standard, mix of two slot vertical/8 (?) slot horizontal, and 5 (?) vertical only), so the CL vertical GPU mounts require different mobo backplates as well. I have the mixed 2 vertical/bunch of horizontal slot option, let me know if you need any measurements/photos.
R5E10 | 6850k | 4x8Gb Trident-Z 3333 | 1080 Ti FTW3| 970 Pro 1Tb | AX1600i | SMA8-A | GTX 560+480+280/GTS 360