Help with Brake Shoes Please??

[72longbed]

I need to replace the shoes (and just about every damn think else inside the drums) on a 1971 HO72 8 lug Rear axle. This is the HO72 that has the pinion tensioning bolt on the side of the center section.

So I go to the Advance Auto Parts and ask for a set of shoes and no less than four (4) different sizes come up in their computer for that year K20.

Does anybody know what the correct size shoe for a 1971 HO72 is?? I did bring with me the completely rusted relics that were on it, but the guy tends to think somebody put the wrong shoes on it at one time.

Also would be super helpful if someone could direct me to a good picture resource for the HO72 drum to drum?

Thanks,
72longbed