c10 suspension help

Hey guys little help please just bought a 79 c10 short bed and im making my own 2 link out of 2x2 tubing and was wondering what the length of the bars needed to be and where the holes needed to be drilled in the link bars for the center spring mount any help would be greatly appreciated

i got link bars from ssd and i ordered 25.5 lowers and 26.5 uppers. are you making them adjustable?

yes they are adjustable i just went to my local metal shop and got 2x2 tubing ordered the square bungs that are adjustable from ssd and made them myself now i just need to know where the holes for the center spring bolt on the rear end goes on the bars