Originally Posted by Rich Browne
They are available in standard and turbo plug (Nova Rossi or Sirio only). Custom made and usually not in stock from local hobby shops - these are for the "ultra-racer"
Purchase from Ashford Hobbies:
http://www.ashfordhobby.com
I know Ace Hobbies had some in stock (They're closing soon - better call quick):
http://www.acehardwarehobbies.com
I would prefer you purchase from these sources. I am happy to help with Tech Questions. Our phone number is listed on the Empire site.
I use mine constantly. It is the easiest way to accurately measure head clearance that I have found. Great tool. Thanks Empire!