Ok, I know I struggled to find things to fit my wallke x3 pro. So here's some info that i hope helps someone. I got my fenders from Rad Power bikes, they're actually for the rad runner 5,I think. The rack is an axiom fatliner. After a couple trips to home depot and a handful of zip ties (I actually used a bracket that came with the fenders to attach the upper support arms of the rack), everything is riding great!
In case you're wondering the other mods are an adjustable stem to raise the bars a bit and swapped out the factory seat for my old comfort bike seat. Probably going to add new handlebars with a higher rise soon, my back is not very strong.
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