I recently fitted an Acewell ACE-3963 dash to a 2005 M400ie, and as part of the install had some mounting plates cut. I got 10 for my minimum design and set up charge, so have 9 left to try to recoup a little of the money the job cost me. I'll detail the drama later.
They're laser cut from stainless steel plate, with hole spacing to suit both early and late Monsters. The early carb models will need the holes enlarged, currently they're 5mm to suit the ie model mountings. $40 each as is. I really don't want to invest any more time in them, so they're flat and raw. As fitted, the last one was bent and polished.