2. After researching part #'s and seeing a difference, are the parts (pistons & seals) interchangeable between the Interstate caliper and the Standard caliper? Nope

...
I've never tried to put an Interstate caliper on a Tourer/STD, but there's no possibility
of putting an Interstate piston/seal into a Tourer/STD caliper...
-Mike
Thanks, I guess I should have done some research first, I will see if it fits the next time I have the rearend apart. If the whole assembly fits I will rebuild with new seals and pistons.
Mike