determine which idler arm I have

From 68/ later there are only two unless it was something weird like BB/ hemi, I know nothing of those

Up through 72 the "studs" pointed up, 73/ later they pointed down

"Old style" up through 72 studs point UP

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73 / later studs point down

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There are FOUR parts concerned with this swap regardless of actual year of car:

Pitman arm, steering box (large/ small spline), idler arm, and the center link