yellow pages look for fasteners or nuts and bolts, be aware that the price of three will normally be same as 10:D
 
fer that many just go to b&q or yer local place that sells screws etc, i buy be the thousands so pay pennies, but expect to pay a bit more at b&q,
 
From memory, they are self tappers and square nylon inserts (Bit like Rawlplugs). My advice is to use stainless steel self tappers as they dont react to the crap that accumalates
 

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