I have not had my 2005 van door apart
on early 2000's GM pick ups they use plastic clips in the linkages for the doors and tailgate
like the black clip shown in your pic
on my pickup the pass door and tailgate needed replacement as those sides are baked by the AZ sun and the clips turned to brittle dust.
the driver door side ( shaded) is fine.
But I have spares, the clips are 50¢ at dealer
have a look at a van forum to see if this is a commonly solved problem