Fule filter bulkhead mounting

Guys, when I removed my fuel filter mount from the bulkhead of my 1985 110 a while back I seem to have dislodged whatever nuts were on the bulkhead that it bolts in to, all I have now is two large holes in the bulkhead and nothing to bolt into. It seemed like there were some kind of nuts that pushed in the holes but I can't find anything now. Can anyone tell me exactly what should be there to bolt into and can replacements be obtained?
Cheers
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rivnuts, if you have a welder you can weld a flange nut into the holes ,flange out

Thanks James, rivnuts obviously pulled out before, so I welded flange nuts in and jobs a good'un.

Shame LR didn't do the thing right In the first place......