I have a Rampage soft top. With their frame. It uses their front header, the one that you posted, that bolts to the windshield frame and has the channel on it that the plastic edge of the front of the top slides into. Like someone just above mentioned above, to install my top, I install my frame to the Jeep and the header channel. I then slide the front leading plastic edge in the channel on the header bar. I then go to the rear of the Jeep and pull the top out nice and straight, over the frame and lock the rear corner edges in to the rail on the body. It may be a little tight. You may have to gently pull down on the top, applying a little pressure to your frame in order to get the corner edges under the body rail. I then wrap my door areas around the supplied door surrounds, then I wrap the interior Velcro wraps around the front bow and rear bow, install my side windows and rear window. I do this usually in November. Typically it’s 40-50* F. I’ll bring the top inside for a few hours that’s morningto warm it up. It goes on smooth every time. You shouldn’t be having this much difficulty. I mean it’s a little confusing for a first timer, but it sounds like you are mix matching parts or we are overlooking something.
The frame I have, has their metal, framed door surrounds. It doesn’t use factory style surrounds.
I don’t know, but I feel like you trying to put a frameless top on a Jeep with a frame?