Hi Abarthbrava, those ones are readily available on ebay and elsewhere, usually about £12, 2nd hand they go for as little as a fiver. Id rather stick with orange ones than have those on my car!
The frosted ones are very rare-like Joske is the 1st person to have found them in almost 3yrs as far as i am aware.
Only other option is to sandblast or use etching spray on the clear ones, or spray original ones lightly in the same colour as the car as skate2create (Dan) has done.
Ben.