Sparco 400/600-Series Seatbase Installation Instructions
(Including Planted, and Sparco Flat-Style 500-Series Adapters)

Warning! Seats are an integral part of a vehicle's safety system design. OG Racing highly recommends that aftermarket seat installations ALWAYS be performed by a qualified installer. Sparco Motorsports products are designed for use on racing or off-road vehicles and are NOT applicable or intended for street or highway use. Motorsports are dangerous. No warranty or representation is made as to products' suitability for use or ability to protect the user from any injury or death. The user assumes that risk. OG Racing shall not be liable to purchaser or to any third party for any damages arising out of the purchase, installation or use of any item.

Sparco offers seat bases for many vehicle applications. However this does not guarantee that every model Sparco seat will fit in a particular vehicle. Please take the necessary measurements to ensure fitment prior to installation and contact us with any fitment concerns or questions at 1.800.934.9112 or

In order to properly install a Sparco seat in your vehicle, you will need ONE of each of the following, per seat:

For Bottom Mounting (Street/Tuning) Seats:

• 600-Series Seatbase (SB600SBxxx), 400-Series Seatbase (SP400SBxxx) OR 500-Series Seatbase (Flat-Style Only, SP500xxx)
Sparco Slide Mount Kit - SP493
Sparco Bottom Mount Hardware Kit - SP50001

For Side Mounting (Fixed-back, Competition) Seats:

Note: Due to the varying widths of Competition style seats, not all seats are compatible with all adapter brackets.

• 600-Series Seatbase (SB600SBxxx) OR 400-Series Seatbase (SP400SBxxx)
Sparco Slide Mount Kit - SP493
Sparco Side Mount Bracket
Sparco Side Mount Hardware Kit - SP50002

Stock seat removal:

1. Remove existing seat assembly from the vehicle - refer to your vehicle's repair manual for instructions on properly removing the seat and disabling any existing safety equipment. Retain the bolts that fastened the original seat to the floor - these will be reused when installing the seatbase.

2. If you will be using the stock seat belt and the reciever is attached to the stock seat, remove it and save any fasteners and other related parts for reinstallation onto the Sparco seatbase.

Sparco Seat Assembly:

Note: The diagram above shows a driver side base assembly, facing forward.

1. If you are going to use the stock seat belt, attach the stock seat belt receiver to the base using the original hardware. In some cases, a nut for the stock seat belt receiver bolt is necessary to reuse it (not included).

2. Attach the Sparco Slide Mount Kit (SP493) using the holes in the base closest to the center. The sliding tracks should be attached using a 6mm allen bolt and 13mm locking nut from the hardware kit. The flat side of the sliding track should be facing the base with the release levers facing forward. Tip: When installing the sliding track, work on the front mounting holes first. Pull up on the release lever and slide the lower portion of the sliding track out to expose the mounting hole. Install the hardware as shown. Repeat the process for the rear mounting holes. Be sure that when sliding the tracks back and forth, both tracks are at the exact same locking point/length or the sliders may bind later. Additionally, make sure the front and rear of the sliding tracks are not cocked in the slotted mounting holes in the base. This will result in the sliding track not sliding smoothly. Leave hardware loose until final fitment.

3. Using the same technique outlined above attach the upper portion of the sliding tracks to the bottom of the seat using x4 6mm Allen bolts. If installing competition seats, attach side-mounts to the sliding tracks using x4 6mm bolts and 13mm locking nuts; then attach the competition seat to the side-mount brackets using the short 6mm allen bolts. Leave hardware loose until final fitment.

4. The finished seat assembly is now ready for a test fit. Make sure the seat has all the proper alignment and clearances preferred by the driver and make marks on the base assembly if necessary. Remove the seat assembly and tighten down all loose hardware.

5. Attach the adjustment bar to each release leaver on the sliding tracks. It may be necessary to bend the bar slightly to properly reach each track. The handle is slightly bent downward to maximize the upward travel. Be sure to install the handle so that it slopes downward. Push the handle all the way down onto the levers. It may be necessary to lightly tap the bar with a rubber mallet in order to get it completely seated.

6. Install the completed seat assembly to the floor of the vehicle using the original hardware. If the sliding tracks feel sticky, loosen the sliding track hardware while the seat assembly is still bolted to the car and slide the unit all the way back and forth a few times to center and realign the tracks. Retighten all bolts.