[Crosley]

The front seat of my 1962 Falcon sags a great deal when I sit on it. Springs are not broken, seem to be weak.

I am looking for the method to strengthen the springs up for new upholstery. To add on spring coils, replace spring coils.

The OE spring coils seem have a complicated bends to them at the attachment spots at the rear of the frame

A few photos. 2 photos show the driver's side of the seat springs. There is a spring in one seat coil. I added the spring in an attempt to beef up the seat some.

The last photo is of the passenger side.

I guess after 50 years the OE springs get tired?

[DanTwoLakes]

Yes, after 50 years the springs lose their temper and don't rebound very well. This is really not a job you can do yourself without the proper equipment. You could add some kicker springs around the perimeter, but you need to attach them correctly or they won't do any good. What would help greatly is replacing the original burlap covering the springs with a better pad, and adding one or two tie wires to all the spring units. The tie wires are more important to the seat bottoms than the seat backs. Check out this thread: Seat Spring Repair

[Crosley]

we are gonna wonder over to H&R Sales in Phoenix... see what they have to offer to beef up the seat.

Car is only used for drag racing at this point. Some time in it's life, the Falcon will return to street use

[ogrebro]

Having owned Falcons in the past and knowing that they get weak seat springs I would agree with Dan. In my opinion when I've worked on mine or customer seats like those I have found tie the springs together (side to side)with a wire in 2 to 3 places with border wire clips so that the springs all work together. That way you are spreading the weight across all the springs instead of only a few. Then attach a piece of insulpad to the springs and then foam to get your seat shape.
Bill