So I got the tank that fits up and down like a wedge behind the seat. It's got a crack and a hole. $200 or $300 to fix it. I'm going to put a fuel cell in for now so I can drive it, but I was wondering if anyone else has had this problem and do the Impala tanks fit up & down like the Olds.

 

I found a pic of an Impala tank still in the car and it looks the same so I think I'm gonna try it.

 

Well I just found a post that said the impala tank is just enough off that it wont work. Glad I didnt waste my money. Fuel cell it is!