You can always make your own one from your stock mount!
Here's a pic of mine i'm half way into it, just cut the top off the stock one!
By a spare from e(vil)bay they always have them and have a go! A lot cheaper than buying it
Hey Odo, what did you use to cut it with, I'm guessing an angle grinder with a cut off wheel probably won't hack it cuz thats all i got laying around right now.