Another lets play "ID these parts"

gm1236 said

These are all ‘73 and up parts. The centerlink would mount from the bottom, nuts facing down. Pre ‘73 the nuts would be facing up, centerlink sits on top. I think the top one is a stock factory part, the others may be aftermarket, fast ratio, like shown in the other thread.

Click to expand...

All correct.
One more thing to look out for is the size of the sector shaft holes in the pitman arms. It seems that even though '73-up power steering used the large sector shaft, some of the aftermarket fast ratio pitman arms have the small, one inch hole.
To get some aftermarket fast ratio arms to work can require using a hodge podge of parts, including the '73-up centerlink, and the '72-down power steering gear.