Hmmm, yes it would appear that you are indeed 'new to this', but don't worry we were all new to this 'interweb-forum-whoodgamaflip-stuff' at some point...

When you say '353' I believe you mean 'E53', which is BMW's own nomenclature on their model series'.

I imagine PDC sensors are the same for the year regardless of motor (engine) size/type, but you will need to know this for other things, be it on here when asking questions (it would help us to help you, so mention it when asking), or when you want to use REALOEM. By the way REALOEM is an absolute goldmine IMO, its extremely useful for part numbers/prices etc.

As well as the 'search this forum' facility you will see at the top of the page 'Articles', and 'How to's' for various models. Have a browse through them and you will see that this site is an absolute goldmine too, with huge amounts of real-world information from many enthusiastic, very knowledgeable, and immensely helpful owners the world over.

Just pull up a chair, get comfortable and prepare to be overwhelmed with all the great info here!!

Again, good luck.