I know the BK mount is expensive, but it is nice. Allows full movement of the seat. Doesn't really get in the way when entering the vehicle.
http://www.bkauto.com/porsche/r2020.php
I think this is the quick release someone spoke about earlier:
http://www.bkauto.com/porsche/r9520.php
It always amazes me how people are willing to skimp out when it comes to safety related items. Spend thousands of dollars on rims/tire/body kits but spend a $127 for an FE mount and people look at you like you are an idiot
Of course, if you have mad skillz, then fab one up!