...I do not have a picture! I can describe the Senser, as it was in my '74 L Model.
I took a good look at it when I replaced Both seats.
The senser is a thin 'Pressure Sensitive' Strip, inbedded under Both drivers and passengers, seat Bottoms.
It is aproximately 1/2 inch wide by 10 inches long.
Two Yellow 14 gage wires, come up from under the carpeting and plug into the unit, under the seat.
This circuit when activated (person sitting in one or both seats), Enables the 'Seatbelt' light, on the dash, to illuminate; ONLY when the seat belt reel(For the Seat being Occupied) is NOT 'stretched', (reeled out). The Reel(both sides), also has a wire, for the same circuit, plugged into in.
When I put in new seats, I just left the wire ends, disconnected and Insulated.
I also disconnect the wire at each Seatbelt Reel, and insulated it from Grounding.
The 'Seatbelt' warning light, does NOT come on, and No buzzer sounds!
I think I have one of those pressure senser strips, in My shop somewhere, do You want it?
I'll see it I can locate it...