Installed these on my car a few months back. They are made by Redline Tuning in the US. They are available for the MPS6 and MPS3, as well as Mazda6 and Mazda3. There are two different models - the QuickLIFT Plus and the QuickLIFT Elite. I purchased the Elite. You can find them here:
Redline Tuning hood QuickLIFT systems - lifts and holds your hood without the stock prop rod. Hood strut, damper, support - Automotive niche products.
Installation took about an hour and is straight forward. Instructions were provided and are clear and easy to follow. Make sure you position the brackets precisely. Otherwise the bonnet will not close flush, the struts may hit underneath the bonnet, and when you pop the bonnet the gas struts may not open/expand in sync (I've seen some sub-par installations on the net).
You can download the instruction manual from their website to see what tools are required for the install.
The lift system works really well. The components are high quality and makes the bonnet a breeze to lift. I lifted up the bonnet of my old man's MPS the other day; after having the gas struts installed on mine I forgot how heavy they were!
It's a small but worthwhile mod IMHO. Why didn't Mazda use gas struts in the first place, instead of using a cheap prop rod? Stingy buggers!
Some pics of them installed on my car (see Redline's website for more):