Yes there should be 2 rubber stops, these are not available on there own but as part of the fuel filler.
They will have fallen out with age or if they got knocked while cleaning/drying water out.
This bit can still be bought from Renault, i think i payed around the £10 mark.
You have to drill out the pop rivets, Renault don't do these anymore but they sell black self tappers, i just fitted new pop rivets and touched the heads in black once i was done.
If you give Adam @ Wolverhampton Renault a call he can supply this part.