Your frame and top look just like those on my LJ. I assumed they were both original when I took ownership of the Jeep a couple years ago. Mind you, I bought it based on pictures alone and didn't see it in person until I got it from the vehicle hauler. After looking closer I believe mine to be an original frame and a Bestop replacement top.
To my understanding the sunrider feature was factory standard for all LJs. Again, your frame looks and acts like my frame. So as others have said, unless it's bent all to hell, that's good to go.
(EDIT: I don't know what frame I have at this point. The two outermost attachment points are snaps, that's where my window straps snap to the frame. The four middle points where the top is attached, those are all screws. WTF?)
I confirmed my top as a replacement when I saw a faded Bestop tag on the rear upper corner of the passenger side soft window. The other clue was the manufacture date and product information stamped into the bottom left corner on the rear window, mine is dated sometime in 2012. Also, when light hits my rear window just right I can make out where (at one time) there was a square Bestop logo decal(?) or marking just above this stamped data area.
Last thing, most, if not all, of what I believe to be factory original tops had undivided side windows. I mean the clear vinyl was all one piece, not two clear vinyl pieces divided by a section of top material. If you go back and look at old promotional materials, all the LJ windows were one clear vinyl piece. I think the dividers came into play as the Jeeps were used and the frame's side bar abraded the windows through motion; then those dividers made of top-material came into play. That top material doesn't show wear as easily as clear vinyl. Just one guy's opinion/hunch. So I'm betting your original top was at some point replaced.
Last point, Bestop is reported to have been the original manufacturer (sub-contractor?) for the original tops. So I've always thought if it has an original frame, a Bestop Replace-a-Top should work. (That's assuming their product stays similar in fit and function.) However, I think anything in your budget which fits an OEM style frame would work for you and your situation.