Wouldn't you know it - my sigma DIY service manual onlt talks about drum brakes on the rear wheels.

Mine has drums for the handbrake and discs for the foot brakes.

If anyone could post/link a procedure/pictures that describes the replacement of these pads that would be very helpfull.

There is only about 2.5 to 3.0 mm left on these pads and its probably prudent to replace them sooner rather than later.
That said - rate of wear on the rear disc pads seems to be about 30,000 KM per mm, so probably still fine for at least the next 10,000 KM or so.

Auto pro sells a bendix set for $63 and a cheaper one for $43.
Curious if anyone has tried some of the cheaper disc pads and how these fared.