I use 5 length. The formula for calculating is:
Rivet length = Thickness of materials + 1.5D
Where D is the rivet diameter.
In the case of my '59, the body/belly/channel are all .032", and I used 5/32" rivets, so the length would be 3×.032" + 1.5×0.156", or 0.3304".
Convert .03304" to 16ths gives a length of 5. (Rivets diameter is in 32nds, and length is in 16ths)
I used about 1 lb of 5 length, 1/2 lb of 6 length, and about 1/4 lb of 7 length.
You could also buy a rivet cutter and cut them to whatever length you need.
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