My doblo van only has speakers in the dashboard, has anyone replaed these with better ones ?
and if so what make and where did you get them from ?

The speakers you need to replace are 10cm (4") and I would recommend either Pioneer or Alpine for the best sound quality at that size. Saying that you will need to replace them with either 2 or 3 way speakers, and one of the only companies that make 3-way speakers in 10cm size are Fli. I use one of their subs and sound quality is good. Here's a link, check out the other 10cm speakers there too but the Fli's are towards the bottom

Should be fairly easy to replace too, if I remember correctly the plastic grille covers just pop off to reveal the 4 screws holding them on.