The plugs should have been in the packaging with the handle mine were. Go back to your MAN supplier and press them for the missing items.I’ve decided to take the plunge and have ordered the bits from MAN (thanks for the part numbers!) to fit to my crafter. But the handle didn’t come with the plugs to cover the bolt heads - as they aren’t on the explosion diagram I’m guessing the handle should have? They also had trouble sourcing one of the bolts but I can easily fix a bolt but the covers would finish it off…
I had mine from TPS as at that time I didn't have a good contact with a MAN dealer.
As a note, I have not fitted the plugs yet as I think taking them out again would damage them and I don't yet know if I have anything else to run up/down the B pillar.