Out of stock for the time-being.  No ETA.
 
This Carb Stud Adapter fits Holley 1904 carbs, as well as the Universal 1V Replacement Carb, allowing you to install any stud mounted air cleaner with a 2 1/4" neck. Carb and air cleaner not included.
 
Adapter available to install standard, 5 1/8" base, aftermarket air cleaners as well.