Brake pedal retract spring

[Astrowing]

My '61 has a weak brake pedal retract and was looking for a new retract spring. I found a listing for 1963-1966, but 1961 and 1962 aren't covered. Are the '61's the same or were they changed in 1963? Also found the 1957-1960's listed. Thanks!

[cwindsor]

I went to lowes and bought one right out of the hardware section... Bought one will a little more pull (Thicker spring)