19-03-2021, 11:08 PM
I think as Squeak already suggested, the holes in the inside face are likely to have held stubby machine screws that tighten onto the pins of the side screens that push in from the top. The hoop mounting points screw into the top of the timber on a UK 4 seat Touer and hang over the edge, but I have held off posting photos of mine in the certain knowledge that there will be someone posting photos of the antipodean equivalent shortly...