1. the stock KA wont really need an oil cooler/filter relocation
2. they make lightweight pulleys for the KA, but once again if its NA then its not really worth your time

but hope his helps, sorry i dont know thread pattern...

you can make your own oil cooler/sandwich plate etc or buy a pre made one. according to this SR kits will work.

Greddy oil filter relocation kit

GReddy 12024907 Oil Filter Relocation Kit SR20DET S13

"how to"
How-to: Build Your Own Oil Cooler: 240sx Articles: Nissan Forums / Infiniti Forums - NICOclub

Unorthodox 021010202 Racing Underdrive Crank Pulley S13 S14 KA24DE

Megan Racing MRPYNS14SR Light Weight Pulley Set S13 S14 SR20DET