How to tell Coolant Tank Cap version

[dammad]

I have a black coolant tank cap on my '99 996 Cab. I have some overheating problems that I suspect the cap may be leaking. However, looking at my cap, I can't see any part number embossed on it.

I'd like to install the 996.106.447.04 cap, but based on this picture it looks like the one I have already.

http://www.paragon-products.com/Radiator_Cap_Expansion_Tank_Cap_p/pp-996.106.447.04.htm

I've never changed the cap, but it may have been changed in 2005 when I brought it.

Do the different cap versions have distinguishing features?

[Loren]

If it does not have the Porsche part number on the cap - it is not a Porsche part. Some dealers were using VW caps when the -00 caps were all leaking in 1998 and 1999. My dealer did and I replaced it with a Porsche cap a year later.

This is an -02 cap but you can see it has the Porsche part number and the Porsche parts logo.

[dammad]

That explains it.

Thanks. You're the best.