Welcome to the "kicking myself in the ass" club! As far as I know, me and you are the only two members, but it's nothing to be proud of I think. I too broke a lug off the socket on my Asus a7m266. Man, I was really sweating it too. I had tied my old hsf on with some 100lb test and a few screws to draw tension...
Right now, you only have 3 options that I have seen, and trust me, I'm paying attention to this now.
1 - The cooler that Tom reviewed that uses the outside lugs of the socket, the same one he said had crappy cooling and I don't think is on the market yet. Go here <A HREF="http://www4.tomshardware.com/cpu/01q1/010306/cooler-12.html" target="_new">http://www4.tomshardware.com/cpu/01q1/010306/cooler-12.html</A> for a look.
2 - The Core hsf. It has the option to use the 4 screw holes that are present in every mb that uses a socket A. I personally wasn't too impressed with this one. My main problem is that every group that tested it (that I saw) got a pre-production model for free to test. A lot of companies give products to people to test with the understanding that the review is a good one. I can't prove this was the case, but it is commonplace now days. And at $80, it was the same price as the way I went.
3 - The beautiful, kick-ass Swift Tech MC462... <A HREF="http://www.swiftnets.com/MC462.htm" target="_new">http://www.swiftnets.com/MC462.htm</A> I chose this and am very satisfied. Why not turn a frantic situation into a god one? Tom rates this as the most efficient cooler on the market. Word of warning: It didn't fit my mobo. But, as you are also, I was in a hard place and didn't have many options, so I modded it. I had to drill the corner off to get it to fit my Asus a7m266. It was really simple, no degree here to do it. I'm not familiar with your mobo, you most likely don't have the 'out of AMD spec' socket that I do, so you're probably ok. It is massive, now I have something to brag about!
The world isn't over, turn this into something great. Those are your options. I had really good luck with the guys at www.coolerguys.com , they really took care of me. Email them at info@coolerguys.com and tell them some guy at Tomshardware forum that had the same problem recommended you to them. I told them I was telling the world about the great service they gave me, that will prove it to them. They can check your mobo and make sure the mc462 will fit for you. No exaggeration: I have received over 20 emails from them from before I purchased it, and from after. I am very pleased with the service they gave me.
Those are your options. Feel free to email me if you need any help from the only other member of the club (thus far!~)
"I've been called worse by better people. You can do better..."