Redcats website is actually pretty good but unfortunately you need to know the part numbers before you'll be able to find anything.
I recently bought the contents of a hobby store that stocked and sold Redcat. Over the past few months I have been slowly catgorizing and posting items on Ebay etc. I have included a link to one of the sites I use when determining what I have and what it fits.
This link will take you directly to the manual section. http://www.competitionx.com/rc-manua...acing-manuals/
I need to watch what I say here as this isn't the forsale section but I do have a number of parts and parts cars. Let me know what you need and i'll see what I have. Can't guarantee anything though as I'm still sorting all this out myself but i'll look.