I had Sparco sliders on my Sparco bases but the sliders were flimsy as hell and wobbled a lot. The bases also needed some strengthening around the front hooks that go into the floor. I got custom reinforcements made for the bases and then replaced the sliders with custom-made hard mounted offset square tubing to get my seat in the right position. Now my setup is rock solid and still has some bolt-in adjustability. If you're in NorCal and want to ditch sliders, call TC Design