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Alex:
Obviously the upper arm is fabricated, and not factory. My guess would be that this was done to position the ball joint that attaches to the top of the spindle more toward the rear. The advantage is to allow more caster to be set. A problem with adjustable upper arms that are based on stock parts is that their lock nuts increase the effective diameter of the tube in the vicinity of the slot. This results in interfere when the caster is set for more than a degree or so.
This is all just conjecture, however.
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Jay Mackro
San Juan Capistrano, CA
'63 Guilia spider
'65 Guilia Sprint GT
'67 Duetto
'91 164L
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