Plymouth. . .

 A careful look at this pic and you will see the old joins and channels that were the joins in the original build of the vehicle. The deep grooves were later filled by tradesmen with molten lead.

 This pic also shows the original joins of approx., 4-5 panels of metal around the rear window and quarter panel/boot area. again these joins are over filled with lead and then flat filed back to a smooth finish. . .

 Dylan has cut out a template and then made up and welded in the new panel that sits under, and supports the bottom of the rear window frame. . .
BTW, that's Sikaflex silicon sealer along the bottom join and not seriously bad welding as the poor quality picture indicates! The photographer will blame the poor light and that's probably true too, coz I'm the photographer. . .hehehe.

A quick blow-over of 'rattle-can' beige and the new rear windscreen looks as if it has been sitting in place for the 60 or so years that the Plymouth has been on the road. . .