I was cleaning up the garage this AM and found a parts bag with the three screws and the o-ring. So...here are all the "verbage" on the bag.

SUB-K5601, Mercedes 722.3 & 7 2.5, IS-5601, 07136.

I realize these aren't MB numbers, but must be Precision Intl. numbers. I think these should help once a phone number could be obtained for the company. I'm pretty sure there was another bag for the other clutch.

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92 300E - 116K miles - Sold
77 Euro 350SL - 67k miles
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2009 Hyundai Genesis - 65k miles