you'll need to go to a Manitou dealer. They should be able to order it for you if it is still produced. There is no gaurentee that the kit is still made, but it likely is still available. If you insist on going mail order then contact online retailers BY PHONE, that are actual bike shops. Sometimes they may have things in stock that are not listed on their sites, or they may be willing to order the item for you and ship it when it comes in. Just be ready for a wait. This is not uncommon, Rock Shox, Manitou, Marzocchi, etc. don't sell parts etc. to the general public. They run through a distributor or Dealer net work for spare parts. So go see your LBS or start maiking phone calls.
disassemble the fork, i.e. separate the lowers from the stanchions, draining the semi-bath oil first of course. Then you'll need to drain the oil from the damper. It is separate form the semi bath. To do this you'll have to remove the top cap from the damper side and pour the damper oil out the top. Then you can remove the damper shaft from the bottom of the stanchion and install the new one. Fill the damper with oil as recommended, re-install the top cap/compression damper assembly (if your fork has a compression damper), slide the lowers part way on and inject the proper amount of semi bath oil in each leg then button her up. Not too difficult, just a little time consuming and messy. So have plenty of rags on hand and do it where a little spilled oil won't hurt anything. The living room ain't the place!
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