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WSB Hero
Bikes: 1993 - 944SS & Aprilia Falco
Posts: 7,795
Join Date: Oct 2002
Location: north east
I've known it done on earlier SS's - Darren (Fiscusfish) has done it on one of his - 50mm fork fitment springs to mind.
A bit more involved than a simple swap but I gather decent mech skills are all thats needed. I think your might be easier as I guess a '98 model will have the larger diameter hollow wheel axle already?
Having said all that - if you are after some specific result - why not have your forks rebuilt, Maxton, K-Tech and mctechnics all seem to be decent workshops - amongst others.
Good luck - Frank