NOS wheel cylinders (when boxed under the original part number) have the same numbers stamped as the originals and your lunch pail parts (I have many of these). Some linings were of course grooved, and some not. For yourself and A12, I have no recollection of seeing riveted linings used on the production line.
Also, a question: All original brake assemblies I have seen use two different hold down spring retainers. The top retainers have the depression for the end of the hold down pin. The bottom one (under the hold down spring) should have only a larger diameter round hole. Are yours configured that way? P.S. The bottom retainer was NOT serviced by Chrysler. Only the part number for the top retainer is in the parts catalog.
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