Thanks for sharing. I can't help but think that with the sliders, the seat is still higher than the OEM seating position. Nonetheless, can't argue if you're happy with it!
I ended up foregoing the slider + 20mm spacer all together and decided to modify the
Sparco bracket to fit around the seat cushion and support. The result is the seat mounted directly to the bracket, sitting at the same level, if not lower than stock.