okay:
Mark, if you were looking for more (though if I were you I'd be satisfied with one that was a snug fit, many people have settled for a lot less...

) then these lot might be good
http://www.grommets.co.uk/indexPlugs.ht ... 4wodSk33Yg
it's a link to grommets.co.uk - they supply similar plugs to the ones used in the AF7 - only problem is that there's a minmum order value of £20...
the AF7 ones also look similar to snowglobe bungs, so snowglobe repairers (yes, they do exist) may be able to help. I can't imagine that it's a valid career choice - I mean, that wouldn't come up in suggestions from the school Careers Adviser, would it? "Okay Bob, you've got a choice of binman, architect or snowglobe repairer..."