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Silicone lubricant should do the trick mate. Available in Halfrauds http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_214714_langId_-1_categoryId_255223
Pretty sure it's similar stuff to what FK send out with their coilovers.
Maybe they sell more of the 86's, so they order more from their supplier and get better prices for bigger bulk orders. That saving then helps them to reduce the cost.