Here is the new oil filter, as well as the regulator plug and leads. Funny how life works. If I'd nailed the pin-striping months ago, I would have finished the build thinking it was accurate, only to find these two key details were missed.
In order to get the pattern of eight openings in the front disc brake completed to a high level of detail/finish, I created a pattern which I used to produce a photo-etching mask. I then did a very deep etching, not all the way through the 1.2mm aluminium sheet but enough so that I had good accurate set of shapes which I could then finish off by drilling out and filing.