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The coilovers will mount to adapters that bolt to your leaf spring perches, not the special Moser brackets for a narrowed rear as shown in the picture.
If you want to narrow your rear to get deeper rear wheel lips or to get rid of C clip axles using Ford Torino housing ends, you'll either need to fabricate those brackets, or buy a Moser narrowed rear with those brackets. This is not an issue if sticking with a stock rear width / housing ends.
I've been trying to get Ridetech and/or Alston to supply such brackets, but no joy yet as they have each told me contact the other (ugh). So, in my case, I'll either be selling my rear to help fund a narrowed Moser rear (I'm wanting to get rid of the C clips and get more wheel dish), or I'll be fabricating those brackets and narrowing my rear w/ new ends.
In short, great system for the buck, easy to install, as long as your sticking with a stock width / housing end rear. Be prepared for more hassle and cost if you're wanting a modified rear.
And, since a little welding is required for the upper brackets on the axle tubes, get the installer to weld the mounts to the frame rails too, instead of bolting them in (good insurance for little extra $).
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