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Where do i get cistern bolts for external mount on a Caroma?

I do not know what model the toilet is but the Cistern was made in 1987 and sits directly on the pan. The bolts slot into a piece of stainless plate that sits under the cistern and is held in place by the nut that holds the cistern outlet in place.
Beat Bruggmann, April 2010
Plumbers Merchant or DIY store - the rubber washer is called a Doughnut Washer (Donut) often comes in a kit with the metal plate and wing-nut bolts - about $10.

http://www.toiletspares.co.uk/images/st/st_CC_kit_doughnut_washer_new.gif

Peccavi, April 2010