new throttle valve for my bike?

I am looking to purchase a new throttle valve for my motorcycle and was wondering what I should be focused on when it comes to throttle valves for motorcycles? How do you guys make sure throttle valves are actually compatible with specific bike models, because I own a Honda, so I want to make sure that the throttle I purchase will work with my bike?

This is what I find when I read the listings of different throttle valves: The throttle body is crafted from durable aluminum alloy, ensuring a long-lasting and corrosion-resistant performance, ideal for users seeking reliable motorcycle components and sometimes they mention what model and brand of bike it is compatible with but other times they do not.

If the throttle is not compatible with my bike will that be a big issue, also what about warranty, usually how long is a good warranty, should it be longer than 12 months? Also I am not sure where I can purchase one of these, I see a lot being sold on sites like amazon, motorvista, GEP, alibaba, and eBay. Also if I am doing a replacement is it better to buy the whole thing or just the valve?