question on stromberg carbs.

am i correct in ***uming that all the stromberg 2 barrel carbs have the same throttle bores,whether they are 97`s,48`s or 81`s.is it only the middle body of the carbs that are different?anybody know if barron has the new 4x2 manifold for sale yet?If so; How much $?
thanks guys

 

81's have smaller throttle bores

 

No ! Each one is different size .

 

i have a couple of 97 small logos for sale