Axminster professional ultimate edge help

Hi, I’m looking to get the AXMINSTER PROFESSIONAL ULTIMATE EDGE, for a little knife sharpening business, but it only comes with 60 and 120 grid belts, and I been struggling to find higher grids, something like 3000/5000.
Do they existe? If so where can i find them???
Thanks for your help!!!

Just put “Ultimate Edge” in the search bar on the Axminster web site, it shows at least 10 different belts.
Hope this helps.