This Covermate 1 made for the Arctic Spas cabinet, to fit over the vertical trim piece. 

Can be used on any spa with a corner radius of 6" to 10".

How to measure the corner radius of Rounded Corner spas:

The Covermate 1 is the #1 Coverlift in the Hot Tub Industry:

• Easy to Operate - The smallest of spa users can operate the Covermate 1 Lifter with ease. The exceptional design allows removal of your spa cover even easier than other 'no name brand' gas shock (hydraulic) cover lifts! Having the centre bar run the entire width of the cover, adds strength, making it much easier to remove your cover.
• Solid Construction -The Covermate 1 Arctic is made with black powder coated aluminum bars and brackets. The 12 point (35 cm) mounting system provides the ultimate in strength.
• Attractive Design -The sleek, low profile, ergonomic look compliments any spa.
• Space Efficient -As little as 10" (25 cm) clearance behind the spa is needed.
• A Simple Design that works - It is proven to be absolutely trouble-free, with only one moving part and a built-in stop mechanism. There is no need to ever worry about springs or shocks needing to be replaced.

Actual Arctic/Coyote bracket pictured below:

Arctic Spas & Coyote Spas Covermate 1 Installation Instructions.