It's all working now, except the one part I need! I have emailed them to see what the crack is...
You can buy the B-bass 4 bridge with the drop tuner on there - not cheap though at €175 😱
That's bloody brilliant that is!
Thanks @Jabba_the_gut
I am starting to think the pickup surrounds are going to have to be made, possibly from a pickguard blank. Stainless sheet, or maybe wood are also options...
https://www.google.co.uk/search?client=ms-android-h3g-gb&ei=Y204W43EN4yHgAb00oKoDg&q=the+presidents+of+the+united+states+of+america+band&oq=the+presidents+of+the+united+states+of+america+band&gs_l=mobile-gws-wiz-serp.12..35i39j46i67j0j46j0.17308.17308..18788...0....104.104.0j1......0....1.........0i71.f3UeT6l%2F6nk%3D
https://www.google.co.uk/search?q=the+internet+band&oq=the+inter&aqs=chrome.0.0j69i57j69i60l3j0.5504j0j7&client=ms-android-h3g-gb&sourceid=chrome-mobile&ie=UTF-8
I didn't have any trouble searching, just add the word 'band' after the name!
It is a Hammerhead 
It's from 2005 I think - an RB-2002. Well-made with decent hardware, its a good bass. I think they were pretty expensive new but can be picked up quite cheap now. I can't say the effect of the brass is hugely noticeable but it does sound nice.