no keep ur rpm carriers for shure! yes casterblocks are needed i aggree there! and flm has then, and u get the flm warrenty

and heres the rpm mount

http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXRB16

anoter way is to take those longer blue rpm posts by heating them and bentd them, they u mount them in front of ur shock

for the rpm mount to work i think u will need a flm tower up front