When you say adaptor, what do you mean?
I have an Aussie head and I had to have an adaptor made to use my 2 bbl carb because the bolt pattern of the carb and intake were off by a little less than a 1/4 of an inch. If that is what you are refering to, any machine shop can do it. Mine was made out of alluminum stock. I had to take it back to the shop because it was too tall and the carb would be smashed by the hood if I closed it. Not what I want since my carb is a new Weber 38 DGAS. I asked the machine shop to reduce the height of 2 inches to around 1 1/4.