72 K10 4x4 with replacement rear axle-Dana 60??

[aotte1]

I have a new to me 1972, K10 with replacement 3/4 ton axles. Is the rear axle a 1971 dana 60? Getting ready to order parts and need to know what the rear axle is? The drums say they are 12", my parts store lists 11" and 13" diameters for brake shoes for 65 to 71 dana 60 rear axles. { also lists 72 to 74 dana 60s as being another different set}

Also is it a good axle to R/R e.g. put money into rebuilding. Photos are of the axle. thanks for the help. I did searches of Dana 60s and the wheel mounting flange looked different.

thanks,
Les