i know the cars that i build for my self and dumas i put the tubes under the cross brace and i drilled a small hole between the two outer holes on the brace so the thubes would be straight and i could run the batteries back .. crc tubes are the ticket for this car just cut the ball ends down so they fit right. on a side not see what happenes when trinity gives cuff a new car he was in the b at vegas bet if he had the blue baby he would of been top three