3.5 hp needle seat question

Hi. I recently ordered a carb repair kit for my NS3.5B2. It included the needle, but not a new needle seat like the one in the attached pic. I'm wondering if these style seats have a rubber insert (or other material) that can wear out or is it just completely metal with a hole for the needle to seat into? If it's just metal, then is it safe to assume that clogging is the usual problem with these and not so much a problem with "wearing out?" If that's true, then I won't worry about returning my carb kit and finding one that includes the seat since I can likely just clean my current one.
But if it does have a rubber or plastic seat inside it, then I think it would be wise for me to return my kit and find one that includes that part since that's something likely to wear out.
Thanks in advance for any help!

The proper kit does include a needle valve seat, but is seldom neded, as the seat is solid brass; The needle has the viton tip.

This shows the kit and its conternts.

Thanks for the quick reply. Since I found this carb kit on Amazon for half the price as everywhere else I looked, I'm just going to let it slide that they didn't include the needle seat (even though their pic showed it included). Now I know that I most likely don't need it.
My motor runs fine below half throttle, but dies above that (it'll run about 1 minute at WOT). I've tried cleaning the carb twice with no luck, but didn't use a new carb kit. So hopefully this will help. Fuel filter is not dirty. Water shoots out of telltale just fine, although it's fairly hot and motor feels pretty hot. But I read from someone on this forum that these little motors do run fairly hot.
If you can think of anything else that a novice like me should check, I'd appreciate any suggestions.

There isn't any thermostat, so check temp with an IR gun thermometer. You want around 150F. If a lot more, check that the pump is good, and passages de-crudded. The pee stream should be warm, not hot. Overheating could cause your issue. Be sure to run TCW-3 oil.

Verify the cap is venting, and the tank strainer is clear.