* Location: It's typically located under the dashboard, on the driver's side, near the steering column. You might need to look behind a small access panel or remove a small section of the dash trim to see it.
* Appearance: It's a relatively small, rectangular panel. It will be made of metal, likely painted black or a similar dark color to match the dash. The fuses themselves are likely the older style glass fuses with exposed metal ends. There will be several small numbered fuses, possibly with a diagram printed on the panel or on a separate sticker nearby to indicate which fuse controls which circuit. Some high-current circuits might use larger fuses, and those might be located separately.
* No plastic cover: Unlike modern fuse boxes with a clear plastic cover, the 1967 LeMans fuse panel will likely be exposed metal or have only a minimal cover.
To get a more precise visual, searching online for "1967 Pontiac LeMans fuse box" along with images might yield results from restoration projects or owner's manuals that show a picture of the panel. You might also find a wiring diagram that shows the fuse panel's layout. A good quality parts catalog or repair manual specific to a 1967 Pontiac LeMans would be the most definitive source.
