wallots exactly right - the two round alum tubes that came with the chassis replace the stock plastic strg spacers.

I used a alum set of arms made by powerline. The plastic bellcrank on the proline set has a reputation for cracking and not lasting. This is the set I used on mine -

http://www3.towerhobbies.com/cgi-bin...&I=LXUL71&P=ML