Try minster products in Sheffield, they measure your screen and make while you wait.
If two far away they will send you a template.
We tried out in Abergele over Christmas and they worked okay for us.
One side fixes over top of door and other two suction pads through window.
The only difference between those for Remi blinds and those that aren't is the internal flaps of material that hook over the door - very easy to adapt a non-Remi blind set by making up a small extra filler piece to Velcro on, that's what I did on a previous set when we changed to a camper with Remi blinds fitted so don't let it put you off buying some without this.Think it will be Silver Screens as they seem to be only ones that cater for the wider Remis fitment that i have!