70 chevy
01108872 = 10/10/69 - 10/31/69 (post 312)
71 chevy
1B639572 = 04/14/71 (post 312)
70 Chevy
0S179038 = 06/27/70 - 06/30/70 (post 312)
70 GMC
AZ5912 = 07/01/70 - 07/17/70 (post 312) Build month number looks like a "T" but I think it would have to be a "7"
69 Chevy
9B852219 = 06/18/69 - 06/30/69 (post 312)