1946-47 horns

[flathead47]

My 1947 convertible does not have the stock horns.
What is the measurement for the correct horns for a convertible with the power top.
I have picked couple of sets but they are two different lengths. I know the lengths are different within the set , but none of the horns in these sets are the same length, each set is different.
Did different body styles get different length horn sets?
Thanks

 

[47topless]

47' Ford convertible horns, with power top, 22" & 17" L.

 

[flathead47]

47topless , is that end to end or flute length only

 

[47topless]

Length of horn

 

[flathead47]

47Topless , one of my sets measures that …. Thanks

 

[47topless]

You are quite welcome. Shortest horn on top of course.