Sire Pickguard Screws

[LSS]

Hi, whilst I am back in the UK I am trying to source decent BLACK (forgot to put into title) pick-guard screws for my Sires.

They are (measured with a tape measure and eye, so not 100% accurate but pretty damn close)
3 mm thread diam,
12 mm long (10 mm thread),
and the raised countersunk Phillips cross heads are 5 mm diameter (NOT 6 mm)

 

I have been searching for ages today and just cant find any with that diameter head (they are all 6 mm)

 

Are these smaller head ones to ISO standards, and not BS or DIN?
https://upmold.com/wp-content/uploads/Data-center/screw-technical-data-sheet.pdf

 

Are these gage 4 self tappers?

 

Can anyone make me feel daft, and direct me to a good source?
Please!

 

Thank you for your patience

Edited 4 hours ago by LSS