Derb, one set of disks looks like it's a 1/4 inch larger in diameter than the others, so those must be the fronts.
The same slightly larger set are also wider by 1/8 of an inch. The cooling fins or support between the discs (front and back) are also a different design.
Since I haven't taken the old ones off to compare diameters and widths, I'm going to assume they are correct.
I'll get my mm ruler out tomorrow and check them. Thanks for the numbers!
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