Hi and welcome a_punker!
It's a question I can give you an answer for. Universal Retention Kit is not compatible to socket AM2 at this moment, so it would not solve your problem. A possible solution is on a market and until now it seems a few people have used this advise to mount Ninja Rev. A on their AM2 Mobos. You need the AM2 retention module from ThermalRight but it has to be Rev. C. Here is a link to a possible source for your purchase
Thermalright AM2 Retention Modul Rev.C
I hope this answers your questions, if not let me know.
Cheers,
Shinigami