Wasn’t sure where to post but here is my mostly complete 74 duster 360

Nice score!

Rear seat. Most likely in the spring of the seat bottom.

If not there, perhaps taped to the top/back side of the glove box liner behind the dash.

Also sometimes found in rear seat back, bottom of front seats, and under carpet. Much rarer but they have even been found above the headliner and inside doors, likely errors by line workers on a Monday after a weekend of too much fun.

Make sure to take pictures of it before removal, in the event it gets damaged during the process of extraction.