Thanks for the pic! The yellow plugged opening is the filler? Is it laying on it's side with the forward face of the tank downwards? The pump opening is on the side away from the camera?
Sorry for the lousy pic, just was the only one i could find...kinda misleading, the floor is actually on the right side of the pic, tank is standing on its passenger side edge...the spray can lid was stuffed in the filler hole because it stunk to high heaven. Somewhere i know ive got pics of the tank sticker/ part number, and it laying in the driveway from all sides as i tumbled it with a chain in it, and pics inside before and after, but they werent tagged 'galaxie' so havent found... Ill search gain by date... The best bet from what ive read is do the 66 swap, and if you have a decent 65 tank, better seal it if you want to keep it
After i dumped the por15 sealer, i brushed the excess poured out over the outside, looks like galvanized, figured why not...