As memo serves all wings for PZL P-11C could have the additional MGs installed. Therefore the semi-drop shaped cowerings of the shel ejection slots were attached to the wings. The different matter is if there were the curved tubes attached or not. It looks like if the MGs were in the wing installed the tubes were there as well. But if the additional MGs weren't attached, the tubes too although the semi-drop cawerings of the slats were left. Looking at the pic posted on the first page I would say the curved tubes were there because the MGs were installed at the time.