Glad it worked out for you.

And NO, C41 and E6 Final Rinse solutions are not the same.

You can make a common substitute as follows:

Mix Photo Flo 200 as instructed.

To one liter of this add between 3 and 10 ml of 37% Formaldehyde solution (Formalin). The range given is what I have seen in EK formulas. I use 10 ml.

This works for C41 and E6, and works for C41 films of all ages.

See the long thread here on stabilizers for color films.