Generally, with this style of chassis on Canon printers, the pads are under the platen, and it's part of the lower base assembly, whereas the tricolor printers like the MG series put it in a white box on the side where the printhead service station is. It isn't hard to check these by any stretch, but you need to take the rear panel (which also acts as the rear paper tray on some) from the printer to confirm the pad location is where I think it is given your chassis.
This video is for the G2010, but the same back assembly steps SHOULD be the same (or at least very, very close).
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@mikegavin78873 let's see if our printer guru @nick can help with this.
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