Is this the correct hardware for pin style calipers?

The pins look the same regardless of year. They will all be the same length, so that doesn't help. If the threaded section is a different thread size/pitch that will be almost impossible to tell in a picture.

You will need to measure the size/pitch of the threads for both the caliper brackets and the pins to figure out what's going on.

I mentioned this in your other thread, but I absolutely used 70-72 calipers with 73+ caliper brackets on my Challenger. At this point I don't recall if there was a model year associated with the pins I used, I don't believe I bought them new so they may have been different than they were represented as.

Do you have pictures of your caliper brackets? They're 50+ year old parts, so it's possible someone damaged the threads, or rethreaded them, or who knows what at this point.
So ,as in your case, if the pins were from a 73 as well as bracket the 70-72 caliper can be used. Thus my pins, as stated earlier, do not match the bracket so bracket is incorrect or the pins. Threads are not stripped. Have tried both good pins in brackets.

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