Having struggled with my 488 race seats being a little low, and not having the factory seat lifter fitted I approached Hill Engineering to see if they had a fix. They didn't ! Working with my car, a 2017 Spider, they have developed a kit which I am testing currently in France. The kit consists of two machined black anodized blocks which can lock together if needed which raise the seat 10mm, 20mm or 30mm. The kit has the bolts for all three configuration included. It took about 15 mins to fit, and initially I raised it by 30mm, which for me was a bit high. After a ten minute adjustment I am now sitting 20mm higher and it really changes the way you can place the car in tight situations. When in situ it looks completely unoticable. Tests will be completed shortly and they will be available from Hill Engineering soon. I have no connection with Hill Engineering other than being a serial buyer of their excellent products over the years. I can fully recommend this kit as a simple and effective way to raise the seat.