There ARE left / right indicators on the headphones. Hard to see, stamped on the back of the folding mechanism knobs.
Ear pads are removable, have a round form (9 cm), thickness is 2 cm (to front site of the head), 2.5 cm (to back site).
So for best isolation, sound and optimal sitting the correct alignment of the headphone and ear pads is important.
Cable is replaceable with standard 3.5 mm jack cable, if the body of the jack is not to thick (max. 9 mm) to fit through the hole of the headphone connection. Of course without locking mechanism, but that`s really no biggie.