Well the carbon deposits on the pistons and cylinders were not the only damage done to the engine of the Golf. When the engine shop removed the head and pulled the valves they found major carbon deposits in the exhaust valve ports! The carbon soot was caked about a quarter of an inch thick on both the valve and exhaust ports! Here is a video of the damage
Also, check out the gallery images of the damage
The engine for the Golf is still in the shop but I got the pistons today. These pistons are made by an OEM supplier to Volkswagen and are bored 0.5mm oversize to fit the new cylinder diameter. Take a look here. Also, pictures 5 and 6 are of the head after cleaning, almost brand new!