I do not know what happened to my 046 to break it as the saw was an abused basket case when I picked it up, initially for parts. I have seen and owned several other MS460 and 046 saws with the same broken mount within the last two or three years, and have split and replaced the halves. Since splitting the cases is somewhat time consuming, I thought about welding some buildup on it and re-contouring it. That really isn't feasible nor fast so I would not consider it unless I had the pieces to weld back in. Not to mention the mag. filler is about $90/lb from my "local" supplier.
As far as screw locations, there are not a lot of good open spots on the 046 between the mount that the tank slides into, the retainer for the chain brake, and the cast strength ribs to tap for a screw. I tapped M4 X 0.7 because I had some short, flat-head screws that size and I wanted a fairly fine pitch to give me the most threads in the case. I cannot really speak to the locations of the ones on Ebay, but I will recommend if you make one, use slightly thinner material than I did, simply because it was difficult to get the bends and radius to match.
