between 100-180 is ok for a good set
BUT what you must check is the rubbers!
good frames are a must , but what you find is most sets are from caravelles and above and so have a rubber to fit the chrome trim !
basic vans , in fact only caravelle and above had chrome trim and the rubbers are different ,so they will not fit a basic van and not leak!
check the finish is the same as your van , if there is a lip these
http://www.ebay.co.uk/itm/221115122618" onclick="window.open(this.href);return false; are for caravelle spec chrome trim and will not work on standard vans!
common mistake by 90% of buyers!
either source some very rare non chrome rubbers or get the caravelle chrome trim to which the outer scrapers are different too!
also worth checking too see if the glass is ' clear ' or ' tinted' ( green factory tint) tinted will say tinted with the other wrighting , clear if not written - at least you will have a match to your van