The XSR700 is heavily based on the MT07 but I guess there's enough of a difference where parts won't be interchangeable. There doesn't seem to be anyone else besides Powerbronze right now. Is the one you bought too small?
You can try making your own extender since the aftermarket seems to be lacking in that area for now. Heard of someone cutting a piece out of their plastic garbage can. They measured, cut it out and installed it using self adhesive velcro. No idea how long this would last but it could tie you over until an aftermarket one comes out.
If the bottom of the extender is lined up with the bottom of the mudguard, the sides stick out at the top.
If the top is lined up, the extender hangs straight down with a large gap at the bottom
It was a bit hard to hold in place and take a photo, but you get the idea.
If you lived in Northern Europe you would not need to ask :grin2:
I ride to work most days, it is usually raining, this week it snowed on me going into work.
An extender cuts down on the amount of spray going over the radiator, exhausts and front of the engine, I even get dirty spray up the sides of the tank.
I fitted this on the rear and it has cut down a lot of spray from the rear wheel.
I'm wondering if you can fill that gap with some sort of black waterproof foam. Just to fill it in.
If you want the extender to line up with the bottom of the mudguard you may need to trim the sides that stick out but then it may not effectively block the water from spraying up.