Shawn,
Not to beat this issue to a pulp
but maybe these instructions may help seeing the difference in the channels...Maybe Matt can help as well on this since he has the STC.
On the STC you'll see the 'C' shaped channel but what I didn't realize is that it appears this then slips/slots into another area that is flat? So now I'm not sure if the people I saw post up in MUD saying that the bestop style bikini would work were inserting the bikini into the 'C' part or in the flat area? Not that it really matters...
Top of page 2, right corner for the first attachment (Bestop) compared to top of pg 2, left side for the 2nd one (STC).
.
Not to beat this issue to a pulp

On the STC you'll see the 'C' shaped channel but what I didn't realize is that it appears this then slips/slots into another area that is flat? So now I'm not sure if the people I saw post up in MUD saying that the bestop style bikini would work were inserting the bikini into the 'C' part or in the flat area? Not that it really matters...
Top of page 2, right corner for the first attachment (Bestop) compared to top of pg 2, left side for the 2nd one (STC).
.