Our '62-'66 Studebaker trunk floors are manufactured in two overlaping pieces that allow for a frame-on and top down installation. The trunk floors as shown can be made to work, with modification, on all '53-'61 types which are pretty much dimensionally the same.
Note the black marked lines in the photo below. You may cut and elevate our panel in those areas as directed or cut the marked areas out if not needed. As usual, our trunk floors are made in 18 gauge steel that was original to your Studebaker.