For those of you enjoying a more refreshing blower experience with your T7 or Fez heater, well done.
I've swapped out the original T7 heater for one of the black ones, it probably went in a bit easier than most as it was largely a like for like swap except for the cable and took me about an hour to do and another two hours doing other jobs I found while in there 
Once the pain of removing the original heater and battery is out of the way, the two brackets are fitted as below.
The furthermost rivet on mine was blind and I couldn't clear it all the way through with an m6 tap so I had to shorten the stainless screw to allow it to fit.
The back alloy bracket lines up with three rivnuts, which ones depends on whether the car is LHD or RHD.
I did not find the wiring particularly difficult, cut of the cable and fit four spades then plug into the Spal plug. then add the supplied heat string and cable cover (not shown).
Next, after a bit of twisting and turning to get it past everything, the heater 'drops' onto the brackets and slides to the back....
...this lets the battery go in after which you slide it back into place and bolt it down. As someone else mentioned I could only get five of the six screws in because the servo was in the way, but its not going anywhere.
The original heater did not need a longer cable as it sat differently but could only be used in a RHD car. For this one I popped all the panels, switches and radio out, then lifted the dashboard top off. I attached the new cable to the old cable with a cable tie, split the rubber grommet to make the hole bigger, and pulled it through the same hole into the front of the car...
...then refitted the grommet and attached the other end to the heater. I found the screw for holding the cable in place on the valve was a pita to get at so I drilled it out and fitted a stainless nut and bolt instead that I could access from above.
Its not anywhere near this powerful, but a whole lot better than the original even in hot weather.
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