Right, but you're going to have to find a source for some really oddball shock bushings, which is why i also recommended the HPI shocks.
HPI's plastic shocks are cheap to fix, and have tons of parts available for them at almost all hobby shops
these are 4" long:
http://www2.towerhobbies.com/cgi-bin...&I=LXM716&P=RF
these are just a hair under 3.5":
http://www2.towerhobbies.com/cgi-bin...?&I=LXM715&P=X