The 98 probably will have the older style box. I get the codes mixed up. My 2001 has the newer one, my older one has the older box. the electrics are different ~ reverse light switch etc need to be changed to suit your wiring. The 2 boxes look different from the outside. Its the later 6 speed box not used in XJ's that needs to be avoided. Sorry I cant offer more help. They are both a pain to take out. if you are make sure you take out the adapter & replace all the O rings, especially the one on the end of the cam. Some of the O ring sizes are given in the parts sticky. Please add to it the sizes of the ones you use. its a good idea to check the adapter housing to make sure the surface around the cam end is flat as around the bolt holes can deform & cause the O ring to not be compressed properly & leak.
Good Luck !
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