I am unsure what you mean. Isn't there only one combination. The vin on the cowl reads "7U160XXX", so don't all 1967 firebirds start with 22337? I think with the 67's there is only one possibility. Let me know if this is correct. I am going to try to talk to the state to see if an assigned vin is a possibility. Not too worried about it affecting value, I am just don't want issues later.