Hi, I'm Raj. I own a REH BS6 2021 model and a 2015 Classic 500 EFi. I live in India, on the outskirts of Mumbai.
Having the above 2 machines, I've purchased quite a few accessories and add-ons for both the bikes. Like quite a few members have opined, it is always safer to get them from RE (if they have it) even if it is at a slight premium. Then there are other manufacturers/providers too who sell genuinely good, well-engineered products . But you gotta know which ones and that comes through one's experience in dealing with them. While I've rarely used ebay.in for my requirements, I've found some good suppliers on Amazon.in But being in India I have the wherewithal to conduct some due diligence and consider alternatives before spending my money.
If anyone feels I can be of help, reach out to me and I'll try me best to assist.
Cheers!