Looks like you still have a section of the old quarter at the bottom of the tail panel still attached. What about cutting this same section off of the new quarter and welding the new to the old right at that seam? That is how I did my quarters at the roof seam. What I did on the tail panel area you are inquiring about is I cut off the lip from the quarter in that section and left just a little bit of it at the bottom and then the area that tucks behind the tail panel at the bumper line. Between those areas I have just a seam.
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