Bird Catchers have 3 bolts in each butterfly,Bugs have 2
Bug catcher butterfly plate have 2 bolt holes and are 3.681" dia.
Bird catcher butterfly plate have 3 bolt holes and are 4.367" dia.
Bug catcher brass throttle stop shafts are .312"
Bird catcher brass throttle stop shafts are .437"
I'm sure this is correct and that Enderle parts are the same. Check to make sure though. Hope this helps!
Good Vibrations Calf. 1-800-576-7661
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Ken Lowe Race Cars Australia 01161-411-699 535