CHEAPEST MADE FROM ALUMINUIM ON EBAY  ,  sliding door stop for campervans , 

MERCEDES SPRINTER, VW CRAFTER, FORD TRANSIT, PEUGEOT BOXER, CITROEN RELAY

FIAT DUCATO, IVECO DAILY, MAN TGE, 

 ,and many more with the sliding door rail in the centre of a van,ideal if parked on a slope, or cooking , keeping your door open where set, been on my own van for the last 3 years, tried and tested on many more,  sold over 400 of these on ebay last year alone,with no negative feedback , can be fixed on a top , or bottom or centre rail , depending on your van,many videos on u tube to show fitting instruction ,  you will receive 1 wedge and a strip of emery paper to clean the surface you are attaching too without any adhesive ,last photo shows it fitted on the centre rail  free uk postage 

CAUTION, do not use locktite double bubble, as it deteriorates after a couple of months,  best thing i have used is sikaflex 522