I had a squeak from the exact same area that sounded just like this and it took me a long time to find the problem. I tried tightening that latch and lubricating all the interacting surfaces and still had the squeak.
What ended up being my problem was the clearance between the pivoting latch...
Is anyone active in this club? I am a bronco owner in Fayetteville and am thinking about getting a group together soon to go off-roading together in the area. I passed another oxford white bronco yesterday near College Ave with the doors off as well and it reminded me to reach out to this group!
Sweet doors! I love the removeable panel idea and the contour at the top of the doors. Should make for a great place to rest your arm when driving your bronco on a beautiful summer day!