Buying off EvilPay or Ammozone is always a lucky dip
General rule is only buy stuff there that is BRANDED and the maker is listed in the add .
Reputable makers have lawyers who troll there sites & check the vendors off against customer lists to try and reduce the number of fake products out there
The check the other products, which is a better thing than feed back
If they are selling everything from condoms to prams then they are salvage / disposal sites and a better than average chance the stuff they are selling is defective quality control rejects, bought as scrap & resold as a good product.
And if they are selling prams & condoms , then that sort of tells a story .
OTOH is they are selling nothing but belts, or outdoor equipment parts then a good chance they are ligitimate mower parts vendors.
I get daily spam from Asia boasing that they can get me 100 good feedback on all my ebay sales ( for a small fee ) and they actually can do it .