I don't think you can, this is when I designed my own and produced it on my 3D printer.
It is basically a 3mm thick flat fascia plate made to suit the 2Din hole in the dash and with a shape cut out to fit the new head unit
It must be made in 4 strips as the printer bed it not large enough for the fascia in one piece, but the pieces are notched out and glued together with superglue. Once dried a light sanding and then sprayed matt black to match the soft coat
All looks very OEM when completed
If you are able to measure the size and position of the hole that the new head unit needs then I'm sure I can produce you a suitable fascia, the better you are able to measure the the better the end result
How are you looking to mount the new head unit (this was my other problem to which I custom made mounting hardware) Check out the 3D printing thread on A2OC for further details
Cheers,
Paul