1923 roadster top

I need help can anyone the actual length of the top bows . i bought a set from Cubels and they are all 37 1/2 inches long. My old bows which may have been original
a very bowed in the middle and are a bit shorter about 2 inches . and are all the bows supposed to to the same length . Any info would be helpful thanks Mark

Here are some diagrams I found on another forum: