I looked at these when I was shopping and was not comfortable with a new compressor for only $385.
On their website they also have an "OEM" compressor for $515.
http://discountacparts.com/addtocart~year~1996~make~Mercedes%20Benz~model~E32~modelname~E320~part~60-00846~cnsuffix~ALL.asp
Maybe these are OK. I decided to go with a genuine Denso form ACSource when I bought one and have had no regrets.
Dan