PCI Slider Right Side Seat Mount - NA/NB Miata (90-05)

Upgrade your 1989-2005 NA/NB Mazda MX-5 (Miata) with the race-ready right-side slider seat mount: the PCI Slider Seat Mount SM-90MX5-R-S2. Built for performance, this mount features heavy-duty engineering with a one-piece 3 mm (1/8″) carbon steel base laser-cut and CNC-formed for superior strength, stiffness and weight savings. The design philosophy rejects the conventional thicker 3/16″ welded brackets by using geometry and bends to achieve equal or greater rigidity.

This slider version includes PCI’s S1 high-strength rails, each fastened to the base with four bolts — doubling the mounting strength compared to typical two-bolt slider setups. You’ll gain smooth fore/aft travel, width adjustment and harness-ready mounting, making this ideal for enthusiast Miata builds or dedicated track machines. 

Width adjustability runs from approximately 14¾″ (375 mm) to 17½″ (445 mm) for standard side mounts (with Miata-specific reduction noted) and a front-to-back travel range of about 9⅝″ (245 mm). The gloss black metallic powder coat finish on side-mounts, zinc-plated Grade 8 hardware, and included nylon spacers deliver both durability and premium aesthetics.

Designed to bolt directly into factory mount points on the Miata chassis, the SM-90MX5-R-S2 offers a clean, fabrication-free installation. Whether you’re installing a lightweight race bucket with harnesses or configuring your cockpit for serious track use, this mount gives you the fitment, rigidity and adjustability you need to drive with confidence.