Projects Looking to identify leaf springs

My dad built our 1940 ford coupe in the early 80’s it’s been kind of a struggle identifying parts on it that need replacing now I have the rear leafs pulled out wondering if anyone happens to know if these springs were part of a kit or off another car ?? I haven’t measured them yet but did find what I’m guessing is a part number ( AF5560N 63)

 

1955 -56 ford

General Spring | Ford Passenger Car 1955-1956 Leaf Springs

 

Those measurements are almost the same I got and I’m sure I didn’t measure exactly right
Thank you