fell into a few mini bikes..... bike 3

#1
i just purchased 4 mini bikes for the bargin basement price of $150.
problem is, i don't know much about vintage mini bikes, and 3 of 4 bikes are completly disassembled.

I was hoping you guys could help me identify the models so i can figure out which parts go with which frame.
Any and all help would be greatly appreciated.

theres 3 briggs engines (one gold, one blue, one black)
and heres the third of 4 bikes.

out of all the bike, this one confuses me the most. it looks like it should have rear shocks (which i have in the parts bin) but i just can't seem to get my head around how there mounted. (or why) should there be a rear swing arm?
thx again
 
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