Reviving a bit of a dead thread but I thought I might add some info. I found out that off the shelf ae86 Toyota Corolla rear lowering springs fit perfectly in the front of an avenger and are a bit stiffer but retain the stock ride height. Well they did for me but my engine is much lighter so they might be like a 20mm lowering springs with the standard engine. I also never got the chance to try it but according to my measurements it looks like the front shock cartridges from a corolla could be made to fit to and are a similar length to avenger ones.