I'm a little confused as well. You say full fenders but then you talk about any modifications that have been made.
I was dead set on running a full front fender on my 76 550. So much so that I had to get a little creative with trying to make it work while running the Motogp exhaust but I finally figured that out. I just like how the bike looks with an uncut front fender. Now the rear was a different story. I wanted to clean things up so I ditched the stock tail light and bracket and went with something smaller and, IMO, more tasteful. Ended up not liking that either and what I kept coming back to was the length of the fender (it extended too far back for my tastes). Since I wanted to keep that factory rolled edge on the end of the fender I bobbed it by cutting off what is normally under the seat and then just rotating the whole thing to the front. I did this several times before I got it to look how I wanted and then I had to deal with mounting it.
Hope this helps you.