This is a custom machined steel flywheel for use on the 1UZ, 2UZ, and 3UZ engines. This flywheel uses the correct starter ring gear, thickness and bolt pattern. This is not a modified 3S-GTE MR2 flywheel!! Those do not work properly for the manual transmission swap onto a UZ engine!! The 3S-GTE flywheel uses a completely wrong ring gear!! This flywheel weighs under 20lbs and is made to OEM spec. Our Flywheels are modified on a CNC mill and balanced to ensure that they will work perfectly for your application. If you are going to use this with a W58, you will need a W58 pressure plate and W58 disc of your choice. If you are going to use this with an SR20 transmission, you will need a 3S-GTE (MR2) pressure plate and SR20 disc of your choice. (I also sell the throw-out bearing spacer for this application and the pilot bushing) I also sell the motor mount brackets to adapt 1UZ/2UZ/3UZ into S-Chassis. Check my other listings! This listing is for one 1UZ flywheel. I put pics of the pressure plates and throw-out bearing spacer for use with SR20 transmission.