SPL Parts 2009+ Nissan 370Z Rear Mid Links

SPL Rear Mid Links (RML) replace the stock spring bucket arms to offer complete control over rear toe, rear spring rate, and ride height. The threaded spring perch accepts common 60mm ID springs and allows corner weighting with fine adjustment of ride height. The upper spring perch also has a linear adjustment range to match the spring location and reduce misalignment.

We recommend pairing our midlinks with our eccentric lockout kit (ELT Z34) to eliminate the stock eccentric bolt, which can slip under significant load and ruin your alignment, leading to aggressive tire wear and poor handling in most cases. This also prevents the need to re-align the upper spring seat every time the eccentric is adjusted.

Does not include springs.

Benefits
Large Range of Toe Adjustment
Lightweight: 4.828 lbs (2.19 kg) per Side with Upper Perches
Quickly Change Rear Spring Rates
Adjust Rear Ride Height
Less Rear Toe Change from Bushing Deflection
Maintenance-Free, US Made, PTFE-Lined FK Bearings
Materials
6061-T6 Aluminum Arm Body
6061-T6 Aluminum Spacers & Spring Alignment Pucks
4130 Chromoly Steel Double Adjuster
304 Stainless Steel Spring Seats
Ti-6Al-4V Titanium Hardware (Anodized Blue)
Swift 60mm Spring Thrust Washers
Noise, Vibration, and Harshness (NVH)
Product NVH Rating

The SPL rear mid links are not a significant contributor to NVH directly, however any aftermarket spring replacement can produces occassional noise during normal operation. Reducing friction at the spring seats to allow the spring to rotate freely will greatly reduce the chances of noise occurring. Nissan/Infiniti also use a spherical bushing on some of the spring bucket arm variations for the Z/G-chassis.

Sold as a pair. One pair per vehicle.

Confirmed Applications

2023+ Nissan Z (RZ34)

2009 - 2020 Nissan 370Z (Z34)

2007 - 2008 Infiniti G35 Sedan (V35)

2008 - 2013 Infiniti G37 Coupe (V36)

Replaces OEM Part Numbers

This is a list of known OEM part numbers. OEMs constantly make changes to part numbers due to part updates, suppliers, etc so this may not be a complete list.

Nissan
551B0-JK010
551B0-JL00A
551B0-JK010

SPRING REQUIREMENTS

60mm ID Springs
Our midlinks must be used with a suitable 60mm ID coilover spring from Swift, Eibach, or another quality manufacturer that is calibrated to the unique motion ratio. Use our midlink spring calculator to find out which spring best fits your needs and setup.

Failure to use the proper spring can result in part failure, bad handling, dangerous driving characteristics, injury, or worse. Please email us if you need guidance.

SPL is not responsible for incorrect or ill-advised spring choice.

FITMENT WARNING

Infiniti Active Steer
Does NOT fit 4-wheel steering (4WS, aka "Active Steer") equipped Infinitis

This Part Fits: