Good job on finding the adaptor kit!

The difference between Huret and Campag is the difference between 4 o'clock and 7 o'clock. Freres Huret place their stop at the 4 o'clock position and Campag, and those who follow the Campag pattern, place the stop at the 7 o'clock position.

The old pattern Simplex gear hanger does not have a stop, accomplishing the job with an eared washer.

Freres Huret began offering an adaptor kit to mount their rear mechs to Campag pattern dropouts sometime in the 1970's. Do not know exact year but estimate ~1974.

There is also a version of the Jubile made to fit a Campag pattern hanger directly.