Hi,
I bet GasGas UK special ordered that spec to avoid the hideous first Sachs 48 forks.
I would guess you would get close by looking at 2007-2008 EC250/300 documentation.
Mz Shiver 45's are your type with open-cartridge, Shiver 48's are the twin-chamber type.
Target weight for stock springs I think in about 70-80 kilos, which is too little for me. I'm 90kgs. Getting a 5.4 shock spring for wasn't a problem, but 4.5Nm fork springs was not easy. I finally found a suspension tuner here in Sweden that had a chat with Ohlins and he got me a set, but they were too short. I had to make a nylon spacer, to add to the stock black spacer under the spring, to remove any free play. Stock space in my fork is approx. 6cm and the homemade one is about 4cm. I'd rather have a longer spring, but that's secondary.
Shim stack is typical GG with lots of free-bleed.
Good luck.
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mint 2008 EC200. Earlier bikes: Husqvarna WR125 '12, Husaberg FE450 '10, Sherco 4.5i '05, EC300 '07, YZ450 '03, WR250F '01, WR400F '00.
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