Yep.So you only need two stand pipes and two dummy plugs to replace both sides?
It looks like a short oily hair to me. But that would certainly warrant further investigation once cleaned up.Is that a stress crack in the fitting or is that just a piece of fiber or something?
NYC F-350,Standpipes and dummy plugs. That way you would have the weakest links in the high pressure oiling system covered.
Oil cooler replacement, I will assume your doing this anyway.
EGR cooler: delete or keep, but replace. A given if you are doing the oil cooler.
Turbo oil drain tube and supply line. (if your truck is an 03-04 or 05, you won't need the new drain because you already have it)
Updated fuel pressure regulator spring.
NYC if you were going to change the STC what else would you change while your working on that part?