hi there looking at the second picture the seal is upside down,you can use the old seal to tap the new seal back in if its not to damaged,and the g is for genuine parts,just make sure you have the right seal and use a little bit of grease around the seal when fitting,and try and keep it square as it goes in,tap it down to nearly flush with the hub,dont use a hamer on the seal or it will be damaged good luck.