[Mark IV]

I have had EXTENSIVE experience with these tanks in my previous business. Ford parts serviced almost all the applications with the C1AZ-8A080-A part number. In reality there are 5 or 6 versions. Differences are in where the rad cap sits, left or right, front or back and how the overflow tube comes off the neck. All will interchange, the differences are only important if you are building an "exact" car. Common problems involve the lower half of the tank coming loose from the bracket, this is due to the replacement radiator hoses used on Galaxies and Thunderbirds. The factory hoses were almost a "question mark" shape which allowed the hose to take up the movement of the enginge when reved or torqued. replacement hoses were "l" shaped and put extra strain on the tanks causing the solder to let go were it meets the bracket. Also leaks where the tanks meet is common and many boneyard units will show signs of "bubba repair" that is large globs of solder placed on the seam in a futile attempt to fix them.

BTW most of the units from Canadian cars had a different supplier and a "CCIAE" number stamped in them.

Rick