I don't know, the one's in the first pics look like rusty pieces of crap that will greatly increase the odds someone will trip getting into or out of your van.
FWIW, I would look up a Jeep or Bronco door limiting strap if you want to go this route.
Herb
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SMB-less as of 02/04/2012. Our savings account is richer, but our adventures are poorer.