Just went thru that process on my 95' 7.3 EB 350 Quigley. Called Quigley. They said just get the Bilsteins for my van as a 2wd, tell supplier that this is the "application", as supplier won't have listing for 4wd van. My supplier(s) were stumped.
Went bilstein.com which is also allshocks.com and related somehow to Turner Motorsports. Looked up the van on site... 2 choices, van or chassis "application"
Got a human on the phone... described my dilemna, he advised chassis/heavy-duty type with a strong degree of certainty (seemed like he understands the products and "application") I am awaiting their scheduled arrival on June 2.
I recommend the site (allshocks.com) and the human connection... now we'll see if they work as hoped. Replaced rear springs w/Ujoint supplied set and really like 'em.
'95 SMB E350 Quigley 7.3
... If you have to ask, you'll never understand...
"... torpedo'd, because we don't generally cotton to bullshit around here." -jage
"... do they ooch apart in the night?" -Dia