As you've discovered, you can't easily slide the new cover into the slots in the cross braces without cracking the new cover. There are two cross braces that run above and below the opening. There are two screws on each end of the cross braces. You can see the screws if you look at the edge of the door by the latch.
There might be an easier way but here is what I did. I removed those screws from both ends of the cross braces and then wiggled them around/tipped them in so that I could slip the sliding cover into the slots. Also, the big metal plate that is in between the cross braces is caulked into place, I had to slice that caulk to free up the cross braces. Once I got the sliding piece in, I just tightened everything up and recaulked with silicone.
By the way - great job adding the photos to your post! Very helpful.
Edit: I also read where some people have shaved off a little from the top and bottom of the sliding cover so that it slipped in easier without undoing the braces. Seems like you would have to be very careful so that the cover wouldn't fall off.
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2021 Winnebago Vista 35U towing a 2022 Jeep Cherokee Trailhawk
2010 Cadillac SRX 2003 Itasca Sunova 30B
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