Should have been more clear - I'm not planning on changing the dash, so the grain doesn't matter.
I want to fit something which latches into place in two places:
The gap between top of centre console and dash
The gap between vent housing and dash
So, as it's designed for the early 156, I need to check whether that stretch of dashboard is the same width, and the two openings in the dash are at the same angle.
Here's a pic of the part on the earlier dash:
Kuda 280045 Naviconsole
It looks very similar to me, but I thought others might know better.