Quote:
Originally Posted by Miko
Yes i know it, diameter difference is 3.19 mm (28.39 vs 31.58)
I don't know what it means / don't understand 
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If the new one is 3.19 mm (.125") larger, then a proportioning valve might be necessary.
The brake shoes that come in the box will have enough for one axle, which is 4 shoes. If you lay them out and compare the lining on them you will see that two of them will have more linings on them than the other two. The one with the most linings (see attachment of the right rear brake) gets mounted toward the aft side of the axle. Looking back at your original picture of the Left Rear Brake it clearly show the different, aft shoe lining is longer than the front shoe.