I voted to reuse neither and here's why:
For me, while I'm not rich and don't have piles of money being guarded by guys with machine guns, I'd rather spend a little more now then risk having to do it a second time. I've never been a big risk taker and sometimes that may cost a bit more but I'm OK with that. It's like replacing the evaporator when I did the heater core. I'm there now, let's just do that too. I know you'll make the decision you feel most comfortable with.
For me, while I'm not rich and don't have piles of money being guarded by guys with machine guns, I'd rather spend a little more now then risk having to do it a second time. I've never been a big risk taker and sometimes that may cost a bit more but I'm OK with that. It's like replacing the evaporator when I did the heater core. I'm there now, let's just do that too. I know you'll make the decision you feel most comfortable with.