WARKS62----THANK You so much for the answers from experience. I WILL be going with TheSierra's....I'm having trouble now attempting to put out another "post" whatever they call that(thread??) here on rc universe.....,...I dunno---point is, if you find the time, can you let me know how (again..forgot) to post another "post" of questions ou there, with an appropriate title. I will--now , despite already having spent some money on robarts, I WILL go with the sierra retracts. i will try an internet explorer search---sierra precision??? thankyou---appreciate the info. so much contradictory infor out there--- Had this kit ( Hellcat and Zero)since the WRAM show, , 2006!!!!! God Bless---Ed Sarkisian [email protected]