I obviously need to replace the front derailleur and two questions answered. First is what would be a suitable replacement? This bike has down tube shifters. The second question is can I take the cage off the simplex and swap it out with the cage on a replacement? I like the look of the simplex cage and would like to keep it if possible. I don't want another plastic simplex FD as it will most likely crack again. The bike is a mid 70's Peugeot AO-8. This is my first restoration project and I am a complete rookie so any help is greatly appreciated. Thank you in advance!