You're probably not going to be able to find anywhere that sells just the key retainers.. Your best bet is to search around for a new keyboard (used) -- probably same cost (or cheaper) than replacing the 5-6 keys. I happen to have an extra FZ-series (which is what's popping up when I search for your model) keyboard (used, but works) here -- if you want it, contact me @ oh.lord.its.spam@gmail.com
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Ive tried looking on line and its like $5 per key, which is just too much when I only need the retainers and the cup things, for the same price for the keys I could buy a replacement key board, which might actualy be a good idea incase this happens again.