In October 2021, during a club tour in southern Penstlvania, I found two MGA with similar Bimini tops. This one had a pair of interesting side mirrors that are attached to the wind wings via a large suction cup. I guess they just get folded in if you want to use the rag top and side curtains for inclement weather.

The rear brackets will attach to the same body points as the original convertible top. There may be more than one vendor for these accessories if you want to buy one.