Greg's adapter for Single plate X-carriage
Chick the following link to download the Greg's adapter for the single plate X-carriage of the prusa i3.
KVR Extruder Mounting plate for Prusa i3
KVR extruder mounting plate for Prusa i3 50 mm Carriage.
Including the J-head mounting plate.
KVR Extruder thingiverse page:
Download the files
Siamese Orchid Vase
KVR Mounting plate
If you need more information or you would like to buy the set