These are chromed saddle springs of the parallel mount type as fitted to the rigid and plunger Norton frames with the saddle mount lugs going vertical - as per International, SOHC Manx and some OHV and SV frames (i.e. check your frame does not have its saddle mounts coming out sideways at 90 degree to vertical - which needs a different spring.
They are in the correct conical shape and have a free length of approx 4.5". Price per pair