they look fine, seem to have all the connections for LEFT, RIGHT, and GROUND. thats all it takes for stereo.
thinking about it from the perspective of the plug which goes into these jacks:
LEFT = the tip of the plug
RIGHT = the shaft/middle of the plug
GROUND = the 'common', its the section farthest from the tip
just by looking at this jack you should be able to sort out which is which.
something worth noting: a general thing to look for in panel-mount jacks (which is the style of this part), is whether the thickness of the panel (the gameboy case) is too big for the length of the threading on the jack. you may not be able to screw the nut onto the jack's threads at all (or far enough) and hold it to the case, if the case is too thick. you can solve the issue if this is the situation, but when buying them fresh its just a good thing to check for. saves having to 'make' it work.