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from cruiserparts.net, one of the best jumpseat references I've seen:
Jump Seat FAQ:
There are 6 total different jump seats.
#1 - 1963 - 1969, long style with 2 bolt holes per a leg
#2 - 1970 - 1973, long style with 1 bolt hole per a leg.
#3 - 1973 - 1975, Short style for roll bar, bad tendency to brake at joints.
#4 - 1976 - 1977, Short style, for roll bar, slightly better bumper design. Still breaks easily
#5 - 1978, short style, excellent for all earlier years, black and has a fold down support leg.
#6 - 1979-1981, short style, It is a bit updated from the 78 style. Steel bottom plate is at edge instead of inset.
#7 - 1982-1985 short style, updated and a smaller fold down leg.
That is not quite a complete list. Don't believe 63 or 64 bolted to the back of the tub. The switch to a single was in the middle of 69. They list 73 twice. The 72 and 73 are different with the angled bottom. I have a 68/70/73 jumps along with the vehicles they are out of. Three different jump seats. 78 also had two styles of jump seats. Started the year with the fold down leg as well as the bumpers that rested on the edge of the wheel well. I have both 78 styles.