yeah you want one from a SQ625 manual, as the auto's came out with an alloy diff, the 98-99 mount is identical to the Vitara, from about 99 onwards they changed the mount design slightly which. you'll need to grab the complete GV pinion mount as the way it bolts to the diff is different but bolts up to the same spot on the crossmember. if you're running the calmini kit & don't want to fabricate a new bracket the early pinion mount is the one you want. then as Chris said there is a later "salisbury" type of diff that came in some GV's & the XL-7
you can just run the steel 3rd member as that is where they usually crack, the housing can crack in some weird spots including the RHS diff bracket mount & the banjo part of the housing.
i scored a brand new later type steel 3rd member off ebay for just over $100 going back a couple years ago, still in the SGP suzuki box & wrapping.

i got the one in the silver princess for $300 about 3 years ago, sold one to Joe for $400 + post earlier this year. i think wreckers/people are starting to realise how sought after they're getting.
i guess you just have to know where to look & have the cash ready to pounce.
you'll use ring & pinion + centre from your diff & fit that lot into the steel 3rd member.