Rate 9 In. Length 2.5 In. I.D. Black Pair. Aldan Springs are made from steel sourced and manufactured in the U.S.A. Spring Rate: 250. Ridetech 11019300 2" Drop Spindles For 1955-1957 Bel Air. Ridetech 11013011 Front TQ Shockwaves For 55-57 Bel Air w Ridetech Lower Arms.