The Michelin Agilis 3 and Continental VanContact Ultra, in 215/65 R16C 109/107T, are available for 3rd generation Citroen Dispatch models at Tyres.co.uk. Before buying these tyres, you should check the registration, load index, speed rating, and commercial tyre specs.
The tyre and paint label on the centre door pillar of the Citroen Dispatch (Driver's Side) shows the correct tyre size. It also shows the inflation pressure and the speed and load rating for the van.
Since the standard models of the Citroen Dispatch are front wheel drive, there is generally no need to replace all four tyres. As you replace the tyres in pairs on the same axle, do your best to maintain a set of like tyres on each axle. Two of the newer tyres should be installed on the rear axle. The rare Dangel 4X4 conversions requires all four tyres to be closely matched.