I don't know if this will help but here's my 3/1 springs with a add-a-leaf kit. Remember the 1/2T came with 3/1 and the "heavy half" with 4/1.We'd need someone to post a pic of a 1500 leaf pack, but I know for sure the second longest main comes out
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Here's a link that shows spring packs and measurements, just look them up.
www.sdtrucksprings.com/index.php?main_page=advanced_search_result&inc_subcat=1&categories_id=1&year_select=1993&make_select=616&model_select=8777&x=115&y=12