If you have the composite cabinet, you can use the standard brackets. If you have the wood cabinet, I believe you should use the special brackets for Sundance Spas. My SD dealer only uses the standard brackets now, but almost all the spas they sell are the composite. The standard brackets are not steel while the SD brackets are and will eventually rust...though the cover lifter itself only lasts so long. I just ordered a Covermate One from rhtubs with the Sundance brackets, but I have the wood cabinet.
I have the Composit cabinet, I think that explains why most say the normal bracket. Thank you for your response!!
The standard brackets cover up the access panels on the wood cabinets. One thing to keep in mind though as you look at your cabinet is the small-profile design of the SD CM1 bracket may allow it to be installed in a "thicker" panel as you will be able to attach not only to the panel but also the surrounding trim.
So the Sundance Model you think attaches to the under frame and not just the panel?