Whilst drilling out my seat rails today i got a bit carried away with a brand new spot weld drill bit and went through the floor and into the plastic tank thing that sits under the drivers seat just above the filler neck.
the bit in the top of this pic

is this a petrol tank expansion tank? if so can i just epoxy over the hole i made? or fibre glass it? or do i need to get a new one?
If a new one is needed does anyone have one?
On the plus side, the seat subframes are modified and nearly ready to bolt in

