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Re: Is this the stock piece for the parking brake retainer?
Not sure what you're asking about "retainer". The little flappy looking things hanging off the floorboard that the cables go right next to are the cable guides, the cables should be inside them. The piece on the threaded rod is the "equalizer": the cable ends go in there. The nut is for adjusting the parking brake. Might have to back it way off to assemble the cables properly then re-adjust; use an open-end wrench ont he little square feature at the end of the rod to keep it from twisting. Correct adjustment is about 12 - 15 clicks of the handle.
Re: Is this the stock piece for the parking brake retainer?
Incidentally, there are versions for these cars that aren't adjustable. That last one looks like one of those. Came in later-model cars generally but I don't know the details of the years. The first one you posted looks like the ones in earlier-model cars. My 83 is just like that. Much better design for long-term maintenance IMO even though probably more expensive to deal with at the assembly plant. I would think it might be possible to put the early-model setup into a late-model car and make an "improvement" that way, if for no other reason than adaptability.
Re: Is this the stock piece for the parking brake retainer?
The later style is self adjusting in the lever. Moving the lever to the released position allows the mechanism to pull the slack out of the cables without needing to get under the car with a wrench to make an adjustment around the torque arm, driveshaft, exhaust, etc.