I suspect it would depend on the model year of your GG EC250.
My 1998 EC250 uses the AJP hubs. But they will not fit my
2002 EC300. Axle diameter is different. I suppose changing
bearing I.D. and possibly O.D. you could make them fit.
Might have to either machine the pinch clamps on the forks
or use some bushings. Depending on if the new axle is smaller
or larger than the old one.
They also might require new spacers.. I bought a used set of
hubs just like the originals on my bike to eliminate any problems.
Front
rear
whole.
Ignore the "chicken strips" I had only ridden around the block a few times
when I took these pictures...
Jeff