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The axle is easily identified by the socket size on the axle nut tightened down on the outside of the hub. If it is 32mm, then you have a standard/smaller sized outer axle spline. If the axle nut is 36mm, it is the JDM ITR/CRV/larger sized outer axle spline. If what you have is the former, then you can purchase axles designed for the USDM '94-01 Integra. If it is the latter, then you will need to source axles that would fit the JDM '98 Spec R Integra.
You always have the option to swap to the 5 lug USDM and then use the 32mm hubs then any Integra drive shaft would work. Seeing as you have nice 4 lug wheels though, might not be an option for you. I did this conversion myself when I had a '96 spec JDM ITR and was glad I did it afterwards for situations such as this.