The trunk weather strip I have used over the years on about 8 -1961 to 1963 restorations has been solid (no holes inside). Soft seal was the brand on most of them as I recall - the shape in your picture looks similar. See my pictures.
The trunk weatherstrip is installed only one way, with the curve to the outside of the car (the weatherstrip is installed vertical
not horizontial in the trunk lip opening) and the joint at the "rear" bottom center of the trunk opening. Original door weather strip had wire push in connectors to the holes in the doors. Repro weatherstip has plastic push in ribbed pins. With the plastic push in pins you have to push them in straight and they can rip out of the weatherstrip -so black 3M weatherstrip is a good back up at the ends and in between the plastic pins.
Do you have larger holes on the bottom of your doors for plastic plugs that hold the weatherstrip plastic pins ( 61 & 62 Hardtop doors do) ? If you do I suggest replacing them with new ones before installing your door weatherstrip. I can take pictures of these items if needed.
Paul
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