The Honda OEM kit for side skids I think is labeled as "Commercial Skid" or something similar.
I'm not 100%, but I think this may be the number you are looking for: 04700-768-E100
That is what I used on my 1132, but it may work for the 928.
Be sure to drill the holes where the spacer plates will sit flat on the side and not up on a stamped section, and of course ream the burrs off the holes and paint them good!
For the time being I am leaving my rear skids on also, but just raised a bit higher.
The only concern I'd have was if your machine is wheeled and not tracked. The side skids may tend to float the auger up and over crust if you have a wheeled machine, unless you are lifting up on bars... where with the rear skids, the auger would have removed the snow/crust before the skid would have a chance to lift.