Just a little update on this.
The connects 2 fasia adapter never quite fitted right. It fitted into the recess at the top but, at the bottom, it was a good few mm to big.
Here is how it looked. Tbh, it doesn't look that bad in the photo but anyone that has one of these will know they just don't fit. (maybe they have been updated now)
I cut off most of the excess with a Dremel and then some sand paper on a block to fine tune it. I applied some of the 3M gloss carbon fibre wrap to finish it off.
I know other people have done this already but I just thought I would show you what it looks like with the JVC unit.