i bought a balance bike for the kid and it arrived with a piece missing, they sent a replacement bike but i figured i’d try looking for the piece, i’ve circled it in this picture but it’s basically the top plastic piece where the fork/handlebar attaches, should be the same as the bottom but the top one is missing. does anyone know what it’s called or if i’d be able to find it anywhere?
This part is probably unique to this balance bike--possibly some other balance bikes too, but it is not used on regular bikes.
On an adult bike, there wouldn't be a perfect match, but this would be something like the "upper headset locknut." This is what the parts of an old-style headset (a closer analog to what you've got) look like: