don't get lucky shim, its plastic
http://www.krypticproscooters.com/fsp-hidden-internal-compression-hic-kit/
the lucky shim is great tho thats what i got
my madd one is holding up well...not sure where you can buy one though :L either that (if you can find one) or a lucky HIC Kit
http://www.luckyscoot.com/compression/hic-kit/
but is it plastic