Mark, yes, both discs have a keeled design. You can see the actual discs in the Manufacturer's forum, look at the specs and brochures.
Laura, you are not a pain, this is why the community was established in 2004. We try to help patients cut through the baloney!
This is a good topic, sift through it carefully:
http://www.adrsupport.org/forums/f50...doctors-11140/
You will find the docs you need -- see all the different sub-topics!