Does anybody know if there are any OEM parts (maybe from other models) which lower my ´93 BB2?
Like the EG-EK-mod in the pic:

 

nobody?

 

i havent ever heard of any. call your local honda dealership. they should know, or they could find out.

 

the local dealership parts desk isn't going to care, won't want to be responsible for whatever mods people do with mix n' match OEM parts, and won't give you a proper answer.

that being said--why OEM parts? why not buy aftermarket springs/coilovers and shocks?

also, with a set of konis yellows you have a little bit of ride ht adjustability by changing the circlip location on the shock. You can lower or raise the spring perches for the OEM springs and probably lower the car 1/4"-1/2".

 

Here in germany LEGAL aftermarket parts for Preludes are hard to find and very expensive.
Used OEM parts are much cheaper and legal. I think its worth a try.