I've run into some axle fitment issues (of my own doing) on my build and have been looking around for alternate parts, hybrid setups, resplining, or even custom shafts and found an interesting searchable resource for outer cv joints. You can use combinations of spline counts to get results which I hope to use to find an alternate for my build. I suppose the alternative is still looking through the Interparts catalog although they are now defunct so you can't buy their stuff.
Search for parts:
https://www.gmbparts.co.uk/hdk-cv-joints.htmlCross reference the part application:
http://hdkjapan.com/en/search/Hope this helps someone.