I have the 05 Ridgeback and the manual sawing its for the Ridgeback b ut I'm guessing they didn't want to modify the manual for just the Ridgeback because it shows the deep side tank and not the shallow bottom feeder oil tank on the Ridgeback. As you said, I had to change oil to find out where the oil level should be with the bike standing level. My fill tube is a long one to the point that a dip stick would be hard to insert and pull out around the passenger peg support. anyway, the oil level for mine is at the bottom of the fill neck and I just made a dip stick out of a six inch section of a tape measurer and keep it in my tool bag. I check my oil cold so I don't fry my arm trying to get back in there. It works out to be about 4 1/4 " from the lowest part of the top edge of the fill neck. That's my story and I'm sticking to it...