Yes, another thing to consider there, the bell on that scope is pretty steep, the cap you are looking at is short with a straight/flat rail. If that ring eats up all the space you have it may not even be able to sit down on the ring bottom.
The 6 screw versions for the USMC rings are not as thick there and the rail sits higher. The 30mm one is discontinued but are some still around, the 34mm with reducers might be an even better option, look at the angle on the bottom of the rail, Vs the other models.
Badger Ordnance 30 mm SIMRAD Cap for USMC Rings 306-70 for sale! Call for best price (570) 368-3920
www.eurooptic.com
34 mm SIMRAD cap for Badger Ordnance USMC scope rings
www.badgerordnance.com
The better question to ask may be has anyone mounted a Simrad on a NX8 and what did they use.