Were all the frames for these 73 - 87ish all the same. I know the Blazers had a different frame in the rear than the pickups, but the front was identical or pretty close. Were all the rears the same for every year blazer? Were the rears the same for every year truck? I know the K30 used different rear spring hangers and longer springs, but were the frames the same as the K20 and K10 (excluding duallies)? If you didn't built it yourself, how can you call it yours.......?