Here's the template sizes,...
https://flic.kr/p/2szxJAD
And as couple more pictures,...
https://flic.kr/p/2szrKqQ
https://flic.kr/p/2szxJAP
On there template, there will be a left and a right handed bracket - and I'm sure you can import the .jpg into something like excel and size it to output the correct size, print it, and cut it out ! - of course, coming from this side of the pond, it's in millimeters !
4 new N&B are required for the screen mounts of course , and the existing aluminium mounting plate can be used as a template to create the "foot" of the bracket. I found the best paint match I could get was a standard spray can for alloy wheels ! Any queries, get back to me !