Yeah, the original 7000 comes with hardware for mounting on Intel's Socket 478 and AMD's Socket 754. The "A" just denoted that it includes stuff for Socket A Athlon XPs.
Unless you move your computer around a lot, with the way the 7000s mount, you shouldn't have any problem with the gargantuan weight of the copper model on an A64 board. However, why not go for the 7000-AlCu? It works exactly the same as the full copper, but it's cheaper and is much less massive.