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Mazda OEM NA to NB Miata Shock Conversion Kit

23993468 - 5XRNA2NBSCK
This kit will NOT work with 90-97 NA Miata Shocks or Springs!

Consisting of all Genuine Mazda OEM parts, the kit includes:

  • QTY 4 - NB Upper Mount Washers
  • QTY 4 - NB Upper Shock Mount Bushings
  • QTY 4 - NB Shock hats
  • QTY 4 - NB Lower Shock Mount Bushings
  • QTY 4 - NB Lower Mount Bump Stop Washers


  • QTY 4 - NB Shock Flange Nuts
  • QTY 4 - 5X Racing 58mm Red Bump Stops (OEM upgrade)
  • Availability: Normally in-stock
    Shipping: In-Stock Items ship USPS Priority unless noted otherwise
    Pricing: $190.00

    Customize Your Item

    Free U.S. Over $150


    The purpose of this kit is to allow 1990-1997 NA Miatas the ability to mount 1999-2005 NB Miata shocks onto their older models. It includes the Genuine OEM Mazda shock mounting hardware from the 1999-2005 NB Miata, which will be needed in addition to your choice of 1999-2005 Miata shocks (we recommend Bilsteins!)

    The 1999-2005 NB Miata is an improvement over the 1990-97 NA in several ways. Mazda improved the suspension with a redesign of the upper mounts, springs and shocks. This gives improved noise and vibration isolation from NVH (noise/vibration/harshness from road noise). For those with 1990-1997 Miatas, these parts will bolt right into the older chassis.

    This conversion kit includes everything you need to install a set of NB shocks and springs into your NA Miata, just add your choice of 1999-2005 OEM Miata replacement shocks (such as Bilstein or Koni). We also offer two add-on options: OEM flange nuts for the shock (correct size and coating so they won't rust). These are M10 sized and will not work with Koni shocks. We also have the add-on option of a set of our 5X Racing 58mm Red Bump Stops. These are OEM upgrades and will provide a far superior bump stop to replace the soft and short-lived OEM bump stops.

    Be aware that the NB springs are a bit taller than the NA springs, and therefore it might raise your ride height. This might be desirable for those who want more ride height for rally or off road driving, or want more shock options than what the NA offerings provide.

    The kit will not work with NA shocks because of the different shaft design of the NA shock. The shank where the shock threads are is much longer on the NB than the NA, and the thick rubber bushings in this kit will not compress flat enough to allow thread engagement.


    • 23993468 - 5XRNA2NBSCK
    • 23993468
    • Mazda OEM Parts and Accessories
    • Normally in-stock
    • New

    Shipping Information

    • Item Requires Shipping
    • 5.0 lbs.
    • W9.5000” x H7.0000” x L12.5000”
    • Free U.S. Over $150
    • In-Stock Items ship USPS Priority unless noted otherwise

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