eccles church, quidenham, norfolk

the early c14 south aisle was demolished c.1740, and the south doorway reused in the blocked arcade. on the wall stub left as a buttress at each end of the aisle is a tall length of moulding, much too high to be part of a window, too close to the arcade to be the start of a new tower and chancel arch. they both look well built, not a bodged tidy up, so what were they for ?