This is the kit they recommend for fitting this window. It does the job, but the kit has two flaws:

1. The adhseive is only just enough to go round. We could have squeezed maybe another inch or two out of the tube, and we weren’t being overly generous. Since you need a continuous bead to make a watertight seal, this is a very streessful operation. We ended up buying another tube of adhesive, just so we had one to hand in case we needed to swap over.
2. The window trim is only thick enough o cover one layer of metal. On a sprinter, this panel has two layers, both of which need to be covered to do a proper job. They should have advised this before we bought, and let us swap out the trim for the correct width.

Not great customer service.

£38 from Van Demon