They do these piston kits for the S4: -
https://www.ebay.co.uk/itm/Andreani-...5/362534927704
Its the same fork as the S4R and some others too.
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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