not clear but theres plenty around one fellow on here some were, i just bought some from my local vynil sign shop stuck it on and cut it out with a scalpel
http://www.ebay.co.uk/itm/3706751874...84.m1438.l2649
this chap was looking at doing them not sure if he did
http://www.oople.com/forums/member.php?u=7394