I have a 14mm allen socket I picked up from the Snap-on truck, a bit spendy at $19.00, but it works great on the 4.5 rear diff. It was too long to work within the confines of the leveling valve on the 560 though. I ended up getting the MB combo wrench, 14mm allen on one end and a 13mm box on the other. Even with that wrench it was a be-itch to get the plug out...very tight.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.