I thought the ride side was 5470126 also but all my of 1970 Camaro calipers show the number 8.
Here are two more pics of the right side which shows the last digit clearly as the number 8 not a 6 and the casting does not look like it has bled into the number to make it an 8
Compare the number 6 in the 1st pic below in the casting mold number "GM 16" to the last digit 8 in the 5470128 casting number and they are different, the last digit is clearly the number 8 not a 6
The number 6 has a larger top circle where it curves around the top and stops to form the 6 whereas the last digit 8 in the casting number 547128 has a smaller circle where it curves around the top to form the top half circle of the number 8
The two circle halves of the 6 are closer to the same size but the number 8 has a large bottom circle and a much smaller top circle so the casting reads as 5470128 not 5470126
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