Hello,
Mercedes manufactured around 22,000 of these W108 (280SE, SEL 4.5) sedans in 1971 and 1972. Most had the 3.27 rear ratio. These "donor" sedans have been out of production for thiry five years. I suspect the supply of these axles will become scarce in the near future.
In addition good 280SE 4.5 sedans are appreciating in value and being restored and preserved rather than parted out. These 4.5 sedans were once voted as one of the all time favorites of the Mercedes Engineers some years back.
Joe Alexander
Blacklick, Ohio