[dadio]

A 2004 top will fit your 2002 cab without any modifications to the locks on your car or the latches on the top so long as the locking pins attached to the top are the non-threaded version. The pins you want have a blunt tapper to tip tip with a short pin entending horizontally from the end of the locking latch itself. The only change made the to locking latch prior to 2005 was Porsche added a plastic sleeve to the ends of shaft to reduce chaffing between the exposed metal pins and the lock itself due to customer complaints about a squeeking noise. They didn't change the receiving lock itself at this time. I know this because I installed a 2004 top from a 996 on my '07 997 back in 2008 by simply adding the older style, pre 2005, receiving locks to the car itself. I did not make any changes to the locking shafts that were attached to the top. ( This is the same style of receiving lock that should already be installed in your 2002 - 996 from the factory. If not, you'll need them anyway and I got mine from Sunset Porsche in Oregon for about $ 250 for the pair + the UPS shipping.
When the 997's came out Porsche made a further change to the shape of the centering tabs on the top itself and the plastic receiving pieces built into the windshield frame that the tabd fit into but for your car this isn't and issue if you use a top from a 996. I didn't find it necessary to change the tabs on the '04 top I used on my car as is still fits snuggly without any issues on the road regardless of weather conditions. No leaks, wind noise or squeeking.

If you need to install the receiving locks there is a good how to on 6speedonline.com step by step with pics and part numbers. I posted detailed instructions on the Renntech site back in 2008 buy did not go the extra step of including the pics as the installation of the locks was pretty straight forward but, with that said, pics always make things easier to follow.

I think I still have the invoice from Sunset Porshe with the part numbers for the locks if you'd like to compare them to the part numbers on locks in your car if it would help. A match would confirm that the '04 top will fit your '02 Cab.