Originally Posted by
smontanaro
Does it make sense to look for a 5mm shorter crank arm for the short side?
I thought about that, and it may well be worth the OP trying.
However, the short crank arm will change multiple parameters including being shorter at the top of the stroke as well as being higher at the bottom of the stroke.
If the Tibia is short, then raising the shoe in whatever method would seem most appropriate (thick pedal, thick cleats), which would get both legs more or less matched.
If the Femur is short (or both femur plus tibia), then it might favor the crank solution.