For that year hull, you probably won't find the seat slides. I looked for a long time and eventually came to believe that the search was hopeless. I made a set but it was a lot of work. The slides look simple but have more detail than you would think at first. I just installed mine so I can say if they will last.
All that said and including the fact that you need a new bushing, I suggest that you consider a new chair slide assembly. There are some reasonably priced ones online.
You need to match the pedestal diameter of course, the bolt hole spacing and current slide base dimensions. Then you decide on what features you want such as slide and to an extent the amount of slide range fore to aft.
FYI, my 2001 seats were not Gaerlick. The actual plastic seat was Todd, I believe but I never found out who made the mount. In any case, I checked all of the manufactures I could think of and none had the slides