I’ve all but completely stopped using eBay and I used to buy everything there. Had great luck w genuine Ford parts in factory packaging, etc. I’ve switched to using Amazon or actual dealer counters, plus my long time, trusted parts shop.
If nothing else, because of shipping time and cost. Nearly everything I buy on Amazon has free shipping and if you need to return it, (for any reason), it’s completely painless and easy. Stuff shows up on my doorstep so fast that it’s almost spooky. I bought a new Hibachi grill on eBay in June, (last purchase), it took over two weeks to arrive. On Amazon, it would have been the next day.
For a Honda timing belt kit, I’d either use dealer or known quality Japanese aftermarket, OEM supplier, etc. I’ve found it easy to establish face-to-face relationships w dealer parts counters and get discounts in this day and age, they know that they are competing w the internet everyday. You just need to go about it respectfully, etc. As a shop, should be a piece of cake.