A flange would be good if you are not a real good welder, it would make it easier. If you use a aftermarket quarter, use the whole end right around the corner and into the door opening. I don't know if you understand what I'm talking about, but it really isn't too hard of a job. If you put flares on there it will make it easier yet. You will only have to do some bodywork right ahead of that front gas tank filler. Good luck with it.