OE GM knuckle designs support the caliper / pads so that the braking (frictional) forces are conveyed to the suspension. Here's a picture illustrating the abutment built into a GM knuckle for a GenII F-body, but many others are similar. It's aligned with the rotor. The frictional forces from braking are transferred into the abutment - knuckle - suspension.
Compare this to, e.g., the Little Shop disc conversion (2nd picture below), although others are similar. The caliper they use (at least in this video on YouTube) has the machined flats on it, front and rear, for the abutments of an OE design; that's how the calipers are intended to be supported. But, unlike the OE knuckle on the GM F-body pictured, Little Shop's brackets do not supply support in this area. The frictional forces are counteracted by only pins bolted onto the Little Shop bracket, and that's a couple inches or so offset from the rotor. These offset forces result in a twisting moment applied to the caliper that is counteracted by the pads and rotor. The OE design does not operate in this way.
Picture below illustrates the GM GenII F-body lower portion of the front caliper, and the abutment on the knuckle which manages the braking (frictional) forces. Top of caliper is similarly supported.
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Picture below is the Little Shop kit with supplied caliper. Notice machined flat on caliper where knuckle abutments would support it in an OE application.
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As illustrated and noted above.
From what I've seen on their site it's identical.
Adding: The pins need to slide freely as well.
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