It seems very peculiar to me that Warburton -- a major mouthpiece manufacturer and custom shop -- (a) doesn't have a Wick 4AL, (b) doesn't know the dimensions of a Wick 4AL, (c) doesn't have an employee who has a Wick 4AL, and (d) doesn't know anyone in their immediate area of Florida who has a Wick 4AL. Never mind the possibility of contacting Wick business-to-business and as a professional courtesy getting the dimensions of a Wick 4AL.
Why in the world would they need a customer half a world away to provide them with an example of one of the most commonly used trombone/euphonium mouthpieces on the planet?
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)