Calipers retaining Spring 1990 cabby

Just been changing front disks and pads but there are 2 retaining springs / clips on them. However one is missing and the other 3 are pretty rusty so would like to buy 4 more 
Can't find them anywhere and don't have a part number so pretty stuck - anyone have any ideas? 

I'm, in exactly the same boat, have been semi searching (not extensive or far and wide at all) for these but haven't spotted any on my travels. 

these should do you fine:
TRW Automotive AfterMarket PFK206 Pad Fitting Kit : Amazon.co.uk: Automotive
http://www.ebay.co.uk/itm/400805765832

VW part numbers you need 2x 191615269A (left upper, right lower) and 2x 191615270A (left lower, right upper)

270A is NLA though