Putting together a custom 2022 OEM+ GR86/brz Oil Cooler/Regulator kit. I got a sweet discount at a local Subaru dealer at San Bernando, CA so I put spent a lil extra on some nice hoses and adapters. The cooler lines measures 3/8" ID and the manifold measures 5/16" ID.
Oil Cooler Complete: 21311AA220
Oil Cooler Connector stem: 21317AA070
HPS Hose 3/8" ID (3ft)
HPS Hose (90deg) 5/16" ID
Reducer Adaptor 3/8"->5/16"
Subaru Coolant
x4 Worm Clamps ~16mm
x4 Spring Clamps ~16mm
Going to reschedule this install hopefully next week when it's not so hot outside.