I'm looking for just the 4 arm 104mm DBC chainring spider for my ERider bottom Bracket. I can't find anyone that sells just the spider. I found the manufacturer's website and they show the part, but there's no way to purchase it.

I'm thinking there has to be some out there. If you wear your bottom bracket out and buy a replacement, what are you doing with the extra spider you now have?
eRider|Battery、Battery Charger、Motor、Controller、Display、Sensor|ebike system solution
eRider provides a one-stop solution for e-bike systems, includes battery packs, chargers, motors, sensors, controllers and display meters complied with EN15194, ISO13849.
erider.com

I'm thinking there has to be some out there. If you wear your bottom bracket out and buy a replacement, what are you doing with the extra spider you now have?