Our front coil springs do not match the look of the original springs in free height (out of the car) or the number of coils. But they act, feel and sit the car the same. According the GM's rear spring blue prints the tension side and edges of each leaf were painted with 3795118 primer, a.k.a. Ionoklad 200J or equivalent. Acceptable equivalents were Tectyl 400C, Sleekote and red primer. The tension side is the side facing the road surface when the spring is installed. We ship our rear springs unfinished so the end user can finish them to their liking. Listen to Franz Estereicher fascinating history of the Corvette rear leaf springs https://www.eatondetroitspring.com/franz-estereicher-on-early-corvette-suspensions/