7.5 litres BL and 8 litres BN according to the ‘tech’ sheet on the main site.
Instead of waterless, which is very expensive I used this: http://shop.citroenclassics.co.uk/propylene-glycol–pre-mixed-coolant-5-litres-non-toxic-long-life-environmentally-friendly-928-p.asp but postage would probably make it as expensive as waterless for you?