You will need two plates that go on top of the roll bar. This allows the top to lock in place at the "center point". I bought a Bronco with dual tops. Came with ZERO instructions on how to install the soft top for the first time. Nor did it let me know that the necessary brackets on the roll bar were factory installed. Though those needed to be adjusted as the top wouldn't latch as factory installed. Also, the cover panels are different and were not included to fit the soft top. Only the hard top versions which came installed with the hard top. My dealer got the soft top versions for me at no cost to me.
So you might need two roll bar plates and two cargo cover panels. As well as the pillar mounts, you already mentioned.
Oh, and you might need the top mounting brackets/screws that hold the top frame in the cargo area. These were pre-installed in my factory dual top option.
I went with a J-Barr system with an Amazon winch to get my hard top off by myself. But I needed a buddy to get that dang awkward heavy soft top on. I was surprised at how heavy it seemed. Might be the balance. I'm thinking of getting another winch and making my own bracket bar to get the soft top off (shortage of buddies that leave near by) by myself.
Bob N - Capt., USAF-Retired
2023 Bronco Big Bend, 1942 Ford GPW (jeep)