Monogram had one several years ago. A google search brought this one up on evilbay:
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&category=2588&item=5931800522&rd=1
a bit pricey for sure; or
Nitto had one too. A more reasonably priced one is available on evilbay:
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&category=2588&item=5931236636&rd=1
Can't comment on the quality of either.