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Hmmm... the answer seems obvious, so I must not understand your question.
The bolts slide in from the outside.... that said, sometimes that body sags a bit on the frame so getting it past the body lip can be a bit troublesome - if so, a large block of wood under the floorboard and GENTLY jack up a bit on the floor to push the body up works most times....
Thread a piece of strong twine through the hole in the end of the bolt then through the holes in the frame and trailing arm. Hold all components in position and pull the twine till the bolt is in position.
I found that it was a lot easier to get it all lined up so that I could push the bolt through when I had the trailing arm centered in the pocket. With the trailing arm to either side I struggled and couldn't get it in. As soon as I moved it to the center the bolt went in easily. I did it that way on the other side and had no problem.
The front bolts on my previous '69 trailing arms went in from the inside. I ran a length of stout picture frame wire through the hole, attached it through the eye of the bolt and dragged it right through. Talk about EASY! I wore out some knuckles coming to that realization (ie. there had to be a better way). the wire held its shape and also did not snag/snap on sharp edges.
With them running through from inboard, was much easier to then put the pins in the bolts on the outboard sides.
OK thanks guys, mine were run from the inside, and the brake line /e-brake cable also run through the area were I have to insert the bolt... Will try the picture wire/twine route...
Thanks, Dan