Underseat key cylinder replacement

[Castle_Rock]

I have a Roketa 150cc scoot - and the key broke in the cylinder - I guess there was either too much tension in the lock or the key was made less quality than average car keys - but is there a good replacement for that cylinder? My gas tank filler is inside the compartment, but I can still access the storage by using what's left of the key to open.

Also the oil release bolt is stripped - if the same applies with Chinese scoots that you turn counter-clockwise to remove, it was on tight as if a gorilla put it on. i had used a gator-grip socket with the pins in it, that might not have been smart, but now will use the standard socket sets. Any sugg. on removing that?

I am in midst of replacing alot of the stock components as well.

Thanks,
Nick