Geeteeoguy is right in that aluminum drums were found on the 80's rwd Cutlass and Regal. These drums must have been an option because most of the cars came with the standard steel drums. The only ones I found were from the early to mid 80's and they have the metric bolt holes, not the earlier smaller sae holes. My 1981 Cutlass was sae and my 1985 Cutlass was metric on the lugs. They are 4 3/4 and the hub thickness is a good 1/4 inch, and the neat thing is that they are finned just like our GTO rear steel drums are. The part number is cast inside the drum and is 1255496 and the 'do not exceed' measurement is in metric.
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