Strange engineering master cyl questions..

My B3356 master cyl from strange engineering needs the lines connected so i went to buy adapters for the -3an brake hose im using.The pnematics shop couldnt work out what size the ports are.The 2 holes definatley apear different size to each other.The one at front is bigger outlet than the one at the back.
going from the web site it claims there is an adapter that is -3an to 1/2-20 and is used in both bore size master cylinders.Im not sure weather to buy 2 of these as im sure both holes are different size????there is no mention of different size holes on web site...
anybody had this problem before..?
what is the both size adapters i would need?
Thanks and regards
Ben.

 

master cyl.

Go onto Stranges site or give them a call. They will help you out. Don

 

Yeah,think I might have to ring them...
Thanks..