I have a new raw trunk divider panel for my 65 coupe with a black interior.
What is the proper color/installation of this panel,
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As a start the insulating panel would be the same on all cars. Since it would not be seen from the interior the interior color does not play a part in the finish or look. Suggest you start by looking at the examples in the Unrestored Picture Thread section of the site under 65 and then Dearborn coupes. If that is not enough to satisfy your questions ask again. Believe some of those great examples should help and provide details yet asked or noticed. Mikes Fall 64 coupe is a really outstanding example and there are some nice pictures posted there
should the trunk panel on the driver's side trunk floor be painted?
Guess your referring to the panels on a coupe that surround the panel you asked about above. The visible areas viewable from the trunk when standing upward were typically painted with the rest of the trunk. Not allot of effort and care was taken to paint the upper edges and the horizontal package tray panel every time so might be a combination of bare steel, red oxide and or light gray primer overspray in those areas
Will look through my pictures to see if I can document any change in materials within the production period. These dividers changed over the years in design and materials used