I installed french head lights in my buddys 49-3100 it's pretty easy
1- remove all the old head light stuff
2- take the french buckets and remove the metal from the inside of the fender,where the old bucket was, till the bucket fits inside the fender
3- this is important when you have the french bucket so it fits before you tack it in make sure it's level and turned in the right direction I pulled a string across both at the same time so I knew they were level
4- clean the metal around the head light and tac alittle at a time all the way around
5- Then comes the body work to blend in to fender and your done


Pete