Haha , its the name of the distance/space ring that sits on top of the magnetic case and are pushed by the backcover to keep the magnetic case in place. Sorry for my bad english This is how it looks :
A bit late to respond and you may have already come across this - http://www.mwrforum.net/forums/showthread.php?p=175190 Not sure how it worked out but may be worth a follow up.
I might sell you one, only problem is I won't split it from the mother ship Will keep my eyes open. Good luck
You are maybe ahead of me but this link may produce a non original if it interests you. Courtesy of "MWR" http://www.milwatchmaker.com/