Stop in for a cup of coffee

this is with the tail panel set in to where the trunk lid would close flush as measured. notice the gap between the end of the amd quarter and the tail panel. I was expecting this to be a flush mount where the tail panel to where I'd just flange the tailpanel to weld it to the quarter. It fits perfectly on the passenger side factory 40 yr old quarter.

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bud - you got this wrong me thinks... the extensions go right to the new quarter - what is the red primered piece in the there?