They are lightened versions of the normal wheelaxles. They are a direct replacement.
http://www.mytsn.com/products/desc.asp?prid=262

I'd suggest running the car with the stock axles first. If you want to try something different I'd suggest using these: http://www.mytsn.com/products/desc.asp?prid=3405

Also a direct fit for front and rear of the 710.