I forgot to order a few things from tower. I still need to get an exhaust manifold and some motor mount screws. I just want to make sure that I'm getting the right ones.

here are the screws I'm looking at http://www3.towerhobbies.com/cgi-bin...?&I=LX2836&P=M and http://www3.towerhobbies.com/cgi-bin...?&I=LXVC43&P=M

now for manifolds I have found a few that Look like they should work. if I can I want to get the HPI one since it comes with everything I need and is alot cheaper. but if it won't work I'll get one of the assosiated ones instead. Will any of them work?
http://www3.towerhobbies.com/cgi-bin...?&I=LXFBA0&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXNYY7&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXKGJ9&P=7

I was thinking about getting the CVD kit too. is it worth the money? http://www3.towerhobbies.com/cgi-bin...?&I=LXAV74&P=7

Thanks