Best place to find new 3/4 ton ball joints???

[valero]

so i cant seem to find new ball joints for my 63 c20?....i keep coming across good deals on 1/2 ton ball joints on ebay, LMC, etc...but no 3/4 ton...

i guess the better question would be: will the 1/2 ton ball joints fit? (my trucks gonna be a cruiser, so im not ever gonna be using its full payload capacity)

if theyre not compatible, does anyone know where i can pick up a set for a reasonable price???