My suspension shopping list and a few questions

[NorCalZman]

I am starting to think ahead down the line to my car's future needs and a new suspension should be up near the top of my list at 88.5k. So, I have started reading old threads, but still have some questions as I start my shopping list....

Shocks: I want to stay OEM or as close to OEM that came on the ZHP as possible. I have read multiple places that the ZHP came with special springs and the ZSP shocks/struts. Ok, so I am just wondering what these front and rear shocks/struts are that are labeled as M-sports II? What is the difference between these and the ZSP shocks/struts? Should I put these on my list instead of the ZSP shocks? ....edit: or do I have it the other way around? We use special shocks/struts but the ZSP springs??
Fronts (M-Sport II)
31312282098
31312282097
Front (ZSP)
31312282459
31312282460
http://realoem.com/bmw/showparts.do?...07&hg=31&fg=10

Rears (M-Sports II):
33522282099
rears (ZSP):
33522282461
http://realoem.com/bmw/showparts.do?...41&hg=33&fg=45

Springs....the same as ZSP springs, yes? P/N do not appear to be on realoem.com or else Id have the specific part numbers here. What are your opinions on aged springs? I have seen on e46fanatics that the non sport springs tend to break. Do not see any reports on here. However, do they wear out? I dont mind buying new ones if it will make a difference.

It looks like I need to add front/rear strut mounts onto my list as well when I find the p/n.


http://realoem.com/bmw/showparts.do?...08&hg=31&fg=10
front spring pads:
SPRING PAD LOWER 2 31331096664
SPRING PAD UPPER 2 31331091867

front "Additional shock absorber" 31336778544

http://realoem.com/bmw/showparts.do?...41&hg=33&fg=45
rear spring pads:
SPRING PAD LOWER 2 33531094518
SPRING PAD 5MM 2 33531136385

rear "Additional shock absorber" 33531138109

Im sure there is a lot more I need to put on my list...Ill keep adding as I dig around and others chime in.