Updated the original design to match the current Prusa x-carriage mounting holes and for 3mm filament. Should be easy to add 1.75mm support as well if needed.
I've verified things fit together as it should, but still waiting on my tubing to arrive so listing as a work in progress till I verify everything.
Sources (including openscad files): https://github.com/mattsch/Prusa3Bowden
Edit: installed and working, pics to follow.