Caliper pin length?

I'm putting disc brake on my 69 charger. I got everthing off a 74 charger and rebuilt calipers for a 72 callenger. The MA article say all the caliper pins are the same. The one's from the 74 are 4 3/4 and the 72's are 5 3/8. Which is correct.

If they are different lengths you need the ones for the calipers you have.Rocky