My 2014 Meriva 1.4 has developed a Code 68, It is with a garage (not main dealer) and they have been trying for a couple of weeks to get a replacement PS pump. Dealer wants 800 plus and vat without fitting, money upfront but will take at least 2-3 wks before part arrives. Seen several on auction sites for anywhere between 200-700 refurb, however although the part should fit, I'm told that it also has to adhere to a magic M number. This was upheld by a seller when I tried to buy the part. Is there anything else I can try ?