If your model doesn't have ISCG tabs you are limited to what brand you can use. You must use a BB mount, which most companies offer, but they aren't all created equal. I learned the hard way.
I have an '09 Sanction, no ISCG tabs. Ordered an e-thirteen LG1+ because I liked the build and robustness of it along the light weight. It comes with a BB style mount adapter plate but due to the unique design of the I-Drive linkage it won't work. The tabs don't position correctly for proper alignment. I ended up having to use an MRP G2 SL and it works great. Not as burly as the E-Thirteen but I've had no problems so far. The newer models with the ISCG tabs can take any brand as far as I know.