SPDZ1 O2 Harness Extension Pair for Nissan VQ35DE 350Z 03-04 Only/ G35 03-04 OnlySPDZ1 350z VQ35DE primary o2 sensor Harness Extensions. This harness extension kit is constructed using OEM Housings, Locks, Wire Seals, and Terminals, as well as MIL Spec M22759 32 Tefzel wire. When installing long tube headers into your 350z you will need to extend the primary o2 sensor wires, with this kit you will no longer have to cut splice your o2 sensor wires, this is a direct plug and play! ***O2 Extension Harness Fitment: Will only work with