Jackpiner Frame Question

[imported_n/a]

Aside from shock mount position, are there any measureable/critical differences between Late 1973,'74 and '75 Jackpiner frames? I've poured over archived postings here and seems that over time frames have sort of morphed from one year to the next. Majority of parts I've amassed for this project are for 74 - 75 build.

P.S.(Anyone got a frame & some additional parts for sale?!!)

Thx again, Chris H.

74 Six Day (Enduro Kit)
74 Elsinore
73 Bultaco Alpina
84 KDX 200