Yes they work as a good spare. If you blow a belt in the backcountry it will get you out, or let you finish your trip. I wound not buy a pro belt for the axys, but if you have them left over use them up.
And RMK Axys belts are different than AXYS_Rush-SKS146/Assault144 belts ,so all wide Body including the new (2018+) SKS owners need the Trail Sled belt
If you have no Cross-Bar on your Bars and your seat is not a Shorty!! Its different from Mountain Version .. I don't care if it says Assault or SKS