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Which one came on a ’72 Mach 1 with a 2.75 open? I’m thinking it’s the 28, but I want to see if I can find out without taking the rear apart.
 

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I would be pretty sure that they are 28 but then agaqin who knows who took apart the rear before you go the car, the best way to tell is still count the splines
 

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I think you can identify the axles by looking at the outer end piece in the centre of the axle that locates the wheel. I think the 28 spline has the normal recessed centre where the 31 has 2 holes drilled.Some of the other guys should be able to verify this for sure...
 
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