CMS Performance Camber Shim Set for Porsche 986/987/996/997/991/992 GT3 Control Arms is used when dialing in alignment range and suspension geometry on supported Porsche 986/987/996/997/991/992 GT3 Control Arms. Confirm thickness, location, and control-arm compatibility using the preserved product details below.

PMB Performance added this context to help Porsche customers review the shim set as part of a broader alignment and chassis setup.

Anodized Aluminum Porsche GT3 Control Arm Shims

Porsche GT3 And Similar Two-Piece Lower Control Arms

Precision laser-cut from 6061-T6 aluminum and anodized for durability, these shims are used to adjust camber by changing length of your Porsche OEM or similarly configured lower control arm (such as these RSS units). Thickness in millimeters is silk screened on each shim for easy sorting.

Available in 1mm, 3mm, and 5mm thickness. For reference, one degree of negative camber is approximately a 5mm shim.

You're Gonna Need A Bunch, Might As Well Save Money

• Enthusiast Pack (two of each shim) save 10%
• Racer Pack (four of each shim) save 15%
• Team Pack (eight of each shim) save 20%

A Note About Fitments

These fit all two-piece Porsche lower control arms (LCA) (except 991 rear and 992 front and rear, which use a different shim shape). LCA shims are typically used in pairs or in multiple-shim combinations. These shims also fits 981 and 718 Cayman models equipped with the appropriate two-piece LCAs.

Competition Motorsport Performance shims can be used on the front and/or rear of any Porsche 986/987/996/997 fitted with two-piece lower control arms (commonly referred to as "GT3" control arms).

These shims only fit the FRONT lower control arm of the Porsche 991 with two-piece lower control arms. The rear require a different shim shape.