| Haggon do a shock for both the 900SS and the 900SSie different part numbers. The ie one is 235mm making it 7mm longer than the earlier SS shock giving a nice increase in read ride height. Either shock is around £255 new.
Its not going to be as good as a Ohlins, but its got to be better than a worn out standard one. As Frank says the alternative is to get the standard one over-hauled and even uprated by someone like Maxton. My mate has a standard one on his 900SS that has WP internals which I think was done through Baines. | 
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