Generally you can find 2 types of 12V 90A alternators from those years in fords…Both have same brackets and will fit.
There is just one difference with „depth“….as you can see in pictures:
both ones will fit your cossie without problem, and will align with service belt pulleys. As you can see bottom one has little wider „FAN“ and need spacer under pulley. One on top has smaller „FAN“ and you need to remove „spacer“ from pulley.