Help with front suspenssion rebuild please..

[im4darush]

I am rebuilding the suspension on my 72 C10 and also lowering at the same time. Will be using 2.5" drop spindles and 1.5" springs from western chassis. Everything specific to 72. My question is related to control arms. I have no idea if the 73+ stuff will work but I do see that it is much cheaper. What are the differences in the control arms when going beyond 72? Do I just have to use 72 specific ball joints with them? This applies to both the lower and upper arms. Rather than blasting/painting the old stuff, it could be easier to just buy new. Thanks!