Yes, those are 67 6 cylinder (L22) springs part number 3909942 code BK. If you just look at the BK designation you won't find it listed as a service replacement code in any P&A manual for either a 67 or 68 car. It is a valid service part number code for a 69 Camaro, but it has a different part number. It does show up in the 67 assembly manual under UPC4=B1. GM did not carry this spring forward into its service parts in 67, instead keeping the 3909941 BJ coded spring instead, which was the G31 version of this spring. Either way its not the orignal spring, or rear axle for this car.