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It would help if you could provide the year of your bike as the center stand lugs where changed a little over time and that might affect the way it will be measured.
Are we talking about the ears that stick up on this centerstand?
http://www.realoem.com/bmw/showparts.do?model=0233&mospid=48044&btnr=46_0556&hg=46&fg=52
I got down on the floor and looked at my R69S centerstand...there was much more than these ears...there was some extra material welded down the vertical portion of the risers. It looks original and quite beefy...also very difficult to measure unless it was off the bike.
I will be able to pull the R 50 frame out and snap a few pics of the lugs with a tape measure. I'll give you a quick explanation of how I added some meat to them without changing them to much. Do you have a good center stand, spacers and bolts to mount on it? That is a must in order to fix the mounts and get them in the correct spot before you paint or powder coat the frame. I bought a new /2 one (can't get the exact one) for my bike while I look around for e super nice original to install
I will be able to pull the R 50 frame out and snap a few pics of the lugs with a tape measure. I'll give you a quick explanation of how I added some meat to them without changing them to much. Do you have a good center stand, spacers and bolts to mount on it? That is a must in order to fix the mounts and get them in the correct spot before you paint or powder coat the frame. I bought a new /2 one (can't get the exact one) for my bike while I look around for e super nice original to install
In your picture above, what is the orientation we're looking at? Is the picture upside down and the front of the bike is to the left? I looked at my late model R69S last night and it doesn't look anything like that.
And I'm guessing that the lug that is broken off is not just a mirror image of the good lug that we can see.
I ran this up the flagpole at the Vintage BMW forum...figured someone might have a bike broken down and could get some pictures. So far, all I've heard is the suggestion to buy Vech's mounts...they're sturdier than the original mounts and that any repairs you might make to reconstruct the old ones will likely just break again. I'm not that familiar with the old vs new mounts and I'm not a welder/metal worker, so I don't really know.
If anyone comes up with something more "helpful", I'll pass it on.