If you have torsion axles on a '61, likley they are welded on to the frame. The early years were like that.
In any case 74 year old springs are done no matter what design and replacement is prudent. In the case of welded axles you have a job ahead. Measurments as to width, mounting and load capacity are necessary.
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!