Whats missing in the diag and may add to some confusion are extra grounds, wires from solder tags in the pup cavities, and an earth wire from the bridge.
Search for 'MN Taper' on here might help 250k or 500k.
I've replaced all my Twin Pickup,Twin Vol to Blend. About 6...
Serrated lock washer...
All the pots, jack sockets, switches over recent years have all only had a plain washer, and one nut. What's that all about?
Lock Washer, Plain Washer and 2x Nuts for 'depth' fitment...
Yep, Modern Surface Mount R C combo's with connection for Gtr or Bass...
http://artecsound.com/pickups/index.html
https://www.ebay.co.uk/itm/252597657610
Passive?
Have you considered an Atec QTP...
Bypass and 4x Resistor / Capacitor Combination settings.... more tonal variance than a Port with a fixed value capacitor... about £18
I have one in my Ibby SR300 'Passive P'
4 NEW tyres for the car... £450
One of them new Squier Sonic P's for £170... just to see.
Curry for the family,
The rest to see us through a week or 2.
Nice
I put an Artec QTP Quad Tone Passive... Bypass and 4 Resistor & Capacitor Combinations... instead of the usual B250K pot and 0.47u Cap... in my Ibby SR Passive P Conversion.
Neat modern take on a tone styler type thang... using Surface Mount components.
Worth a mention is that the Artec Quad's need a 9mm mounting hole, up from the std 7mm of mini pots.