I usually don't do SAE measurements, but I can't find my metric caliper. I actually don't know why I have an SAE caliper because I have never used it until now. My SAE tools are all thrown in a 5 gal bucket. Which has been kind of a pain lately because I've been doing some work on my buddy's '64 vette and messing with old American iron for my trans stuff. Every time I need a tool I have to dig through a half full 5 gal bucket for the right size, I swear it seems like I have 500 of the same wrong size socket before I find the right size. Haha
To be honest, I usually stay away, far away, from Peach Parts forums and MB.org forums. Back when I was on there, I had the impression people were pretty dick to anyone that popped in and wanted to do anything but put MB factory parts where they are supposed to go. Then it was, well, I guess it is OK if you replace a factory part with a similar factory part, but only if it fits as is. If you weren't part of some official race team spending big $$$$$, you had no business modifying a MB. It rubbed me the wrong way, so I just don't go there. Though it is nice to hear the is a bit of a change to that.
The shop will stay nameless until I at least go by and talk to them. It is entirely possible they had an apprentice do it (I saw one in there the other day). That doesn't mean that it got done any less wrong, but I don't want to publicly flog someone until I hear their side of the story and give them a chance to make it right. People make mistakes, and my personal opinion is how people own up to their mistakes says more about them than just about anything.