I installed Jarek's shifter paddle extension but it kept breaking on me, so i took his measurements and derived my own shifterpaddle extension from it.
I made the obvious breakingpoints of the Design thicker in the hopes that it will prevent snaping.
Furthermore did i bring the paddle forward about 10mm because i use my G27 with QD wheels and they add a little bit of extension to the steering axis.
If you also use a modded Logitech G27 with JEBurroughs Quick Release and mwelters Magnetic Ring, I also uploaded a slightly modified version of it that works with these forward positioned metal pedalshifters.
The author remixed this model.