You won't find a one piece pan, even with the 67 up, unless AMD started making them. Replacement pans are four pieces and not a complete floor, you will need to trim and fit them and only cut out what you need to and I don't think the section under the seat is available for either years.
I'm pretty sure Laysons sells floors for the 63-66, they may not show up in there search though. I've found that there search leaves a lot out. Contact Rick on this site if you are going to order anything from Laysons though or you will take a chance of not getting your parts for a while or not getting what you ordered.
