That would be a G13 crankshaft, and you need to confirm which engine is in it - the G13A or one of the G13B variants - either find the engine number on the edge of the block alongside the bellhousing - or look for the capacity marking (1298cc or 1326cc)
What that reveals is that is not the original engine - a G16a has been swapped in at some point - so assuming that you do need a crankshaft, you'll be needing one for a G16a. G16 swaps into the Samurai are very common, to the point where several vendors offer kits to do it.
Why do you think you need to replace the crankshaft?
I bought the car from an old neighbor who had it parked for years didn't know what was wrong with it. So as part of the rebuild i took the engine parts to the machine shop and thats where they said the shaft had been ground to the max and i need a new one.
Google part number #12221-71C00 - whilst I don't guarantee that is the correct part for your engine, that is the part number for the crankshaft used on the G16 engines in the US Sidekick & Vitara from 1991~2003, the 1989 & 1990 engines used a different crankshaft.