how did that piece come off??? You would wanna look up half cut shops around PJ, Kepong, Puchong... or sunway if they have one.
If all else fails, try auctions.yahoo.co.jp
Lotsa spares for sale but you'll need to have an account in Japan or contact those in ZTH who are able to bid for you in Japan.
http://search1.auctions.yahoo.co.jp/jp/search?p=%a5%b9%a5%ab%a5%a4%a5%e9%a5%a4%a5%f3&auccat=26318&f=0x12&alocale=0jp&mode=1&apg=83