a lot of people use Aeroquip fittings & hose to mount the 996 fuel rails into the boxter. i went the other route & mounted the boxster rails to the 996. pretty simple; requires cutting off a couple of mounting tabs & fitting the rails using compression clamps. piece of cake.
two of the original mounting tabs lined up nicely, but didn't allow enough depth to the injector mounting IMO. i felt comfortable with them a bit deeper in the ports.
i used 3/4" compression clamps for three areas & a 1" compression clamp with a little rubber shim on the last. works like a champ; everything is nice & tight.