I have never done the mod myself, but looking at my S1 (which has pop outs std) the B-piller trim hides all the hinges, whilst the C-piller does have a recess and hole for the part that opens (part 4>13) So you might be best off getting hold of a pair of S1 or XR3 C-piller trims? Tho should be able to cut yours accordingly to make em fit - ask BI9 TRB (user on this BB) as he fitted the openeing quaters to his S2 a while back. Also James Raby is another I know that ahs done it