FW8G-STT filter wheel adapters

Hi, I own the above filter wheel and would like to know all adapters that are available for this filter wheel. I currently have the 2.156 male adapter but I can not find any adapters for this thread. I need a female adapter of the same thread dimensions.

I have looked on the SBIG web site, but there are no mechanical drawings so I can make the proper decision for my filter wheel.

Thanks for any help,

James