I can confirm foglights from a Citroen Xsara Picasso 2000-2004 fit perfectly. I installed 2 last week, perfect fit 
Most French and some UK models of Citreon,Renault and some newer Mondeo all have the same lamps fitted from 2003 omwards.Valeo is probably the best to buy if you can and these can be bought through and motor factors new very reasonable.The Depo lamps are a Taiwan aftermarket part but are probably ok Its basiacally a flat based circular lamp from megane/scenic/clio etc from 2003 onwards
Most french cars ie ,megane,clio,scenic and some peugeot also have same lamps fitted and you can get them in local motor factors.Basically and renault 2003 onwards .I have being using them for few years and are perect .Valeo is best but Japanese cheapies are available like Depo etc
Jag x,MGzt, citreon picasso. and mazda all fit, if you are stuck for the loom IE:- if it does not have one ,a ring fog/spot light wirinig kit can be gotten on the bay and fitted to the OE switch
M-m