Urgent! Need advice help on brake pads

Sorry for the urgency, my dad's old Merc brake pad warning light has come on and I'm keeping an eye on some pads on eBay which due to end today. Since I want to save him been ripped off by likes of Kwik Fit, I'm just wondering if anyone knows the parts required to change his brake pads (front and back) please?

Car detail:

Merc C220 petrol (1996 - P Reg)

I believe the model is W202 if that make sense to anyone!! Also, I was asked whether it is 1 or 2 pins, haven't got a clue. So if anyone has a Merc C Class Haynes manual handy, could you let us know please?

Thanks in advance