Maybe it's something Hobie is now doing on later production runs, but my P/A DEFINATELY came with the both sets of adapters. In the bag with the wiring plug adapters are the Lowrance mounts, Hummingbird mounts, along with the screw, nut and side plates to secure the transducer to the plate on the bottom of the boat.
Jeff - what you are looking at are the mounting parts for the 2 different types of transducers that Lowrance offers that mount in the receiver - it is not for hummingbird. The little ones are for smaller ones, and the other arms are for the HD larger transducers. The Hummingbird adapters are yet another set of parts which are not included with the boat. Review the manual page 5 shows all the parts which are included - the little plastic brackets are shown there http://static.hobiecat.com/digital_assets/pro-angler-manual_rev120827.pdf
Page 17 shows how they are used to mount the tranducer on a standard model - for an HD model you'd use the other mounting parts included. (for a hummingbird you'd still need a 3rd set of plastic adapter parts sold separately through any Hobie kayak dealer)
I just wanted to post here again so that people don't take your posts to be fact - you're statements is not correct, so want to make it clear to everyone.