If you are just looking for an NMO mount that will work with your 900MHz radio, and if this is a "normal" mobile install, you shouldn't have any issues using the standard NMO mounts with the LMR-195, LMR-200, or even the dual shield RG-58. I've even seen a few running RG-400. I'm using standard NMO mounts with dual shield RG-58 at work on our mobiles, no issues. If your system is designed right and you use a good antenna, the slight additional loss in the coaxial cable won't be an issue.