350Z/G35 RWD Differential Mount Bushings - OEM-Height Repair Paths

LH/driver differential-mount insulator: 55476-AG001 -> 55476-AG003. RH/passenger current number: 55476-AR003; no earlier Z33/V35 number was established in the reviewed sources. Complete rear suspension member: 55400-CD011, 55400-CD020, 55400-CD021 -> 55400-CD02A. The member chain is the OEM path for the non-serviceable large rear bushing, not a bushing supersession.

First identify which mount has failed. The two smaller OEM differential-mount insulators are individually serviceable; the large rear fluid-filled differential bushing mounted in the rear member is not sold separately by Nissan or Infiniti. Aftermarket bushing-only kits avoid replacing the complete member, but kit contents vary and must be checked. Rear subframe-to-body bushings are a separate job and are not differential-mount bushings. A 12 mm raised differential-bushing option is a geometry modification, not an OEM-height repair: GKTech states that it raises the differential 12 mm and also warns about differential-breather contact, clearance checks, tool limitations, and diff-brace incompatibility. Raised options are excluded from this page.

OEM-height paths only: Z1 urethane complete differential-mount set; Z1 solid complete differential-mount set; GKTech OEM-style solid differential bushings. Verify whether any other listing contains only the large rear bushing or a complete differential-mount set. Do not group raised/riser options or rear subframe-to-body bushing kits into this row.

This page covers OEM-height differential mounts, not rear subframe-to-body bushings. Z1 sets were explicitly in stock. GKTech showed backorder language and its raised 12 mm option is excluded. Solid mounts can increase NVH. The large rear OEM bushing is serviced only with the complete rear member. Compare kit contents and material before purchase. This polyurethane listing is an aftermarket differential-mount kit and should not be described as identical to the Z1 urethane or solid sets.

Supersede reviewed 10 unique research sources for this guide. 4 also appear above as a seller or official action and are not repeated here; 6 additional citations follow.

Research last verified 2026-07-12.

1. Nissan Parts Deal — nissan insulator diffe 55476 ar003Open source
2. Infiniti Parts Deal — infiniti insulator diffe 55476 ag003Open source
3. Nissan Parts Deal — nissan member compl re 55400 cd02aOpen source
4. Infiniti Parts Deal — infiniti member compl re 55400 cd02aOpen source
5. Infiniti Parts Deal — rear suspensionOpen source
6. GKTech — z33 g35 solid rear subframe bushesOpen source