Dean, I'll be curious if anybody else has a good answer.
I cannot be certain that my lower rear control arms were positioned as per the factory install because I am not the original owner and the rear had been swapped before I bought the car.
When I pulled mine off, I did tag them for orientation.
My LH arm (driver side) had the round hole to the front. My RH arm had the oval hole to the front.
The factory illustration found in the MPC does not show the round & oval holes, however it does provide a clue. It depicts the RH arm and shows the bushing installed from the inside (car centerline) side of the arm.
Doesn't depict the LH arm but you might guess that the intent was to orient them both so that the flange of the bushing was closest to the car centerline on both sides.
And I think that is how mine were oriented. Assuming the flange of the bushing presses in from the side of the arm with the formed "socket" and protrudes thru to the "receiver" side that is just a flat opening.
I think the socket is on the flange side of the bushing because mine show the evidence where the original bushing flange cut into the high spots on the outside of the arm on the socket side.
Correct me if I am wrong please.
Like you, it seemed to me they could go either way and wondered why mine were oriented reverse on each side, but after going thru the above, maybe they had a reason to orient the bushings and that is why my arms were reversed side to side.
I plan to reinstall mine as they came out. BTW, mine is a '64 GTO convertible built at Fremont in Nov. '63.
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