OH, he's doing a AX-5 to AX-5 swap. As long as it's an AX-5 (1985-2003) you can use it. You'll have to swap out the shifter though.
Good luck finding straight GL-3. The GL-5 is only a myth these days. The blend was reformulated soon after it was released and rebadged GL-5, MT-1 and should be syncro friendly. I think you'll be hard pressed to find GL-5 that isn't MT-1.