My rear springs on the 67 were weak so I decided to change them. I looked up through several sources and ordered some MOOG springs. I received them but they don't fit, they are too short. The springs I took off are approximately 18.5" free. The new ones I bought were around 15" (whatever MOOG says are supposed to fit the 67) I installed them anyway just to see how it sat. Clearly, it is way to low. I need to go back with the size of the old ones I took out. I don't understand why there is an descrancy. I'm not sure its the originalk rear end but I thought an A Frame GM would be the same regardless if it fit under the Goat. Anyone ran into this? Any words of wisdom?