This is what I use on all my builds to attach VGA RAM Heat sinks:http://www.newegg.com/Product/Product.aspx?Item=N82E16835100005
He doesn't want to order stuff though.
@OP: Give it a go, I've read that people have managed to reattach them a few times. Just let the memory heat up a bit and pop them on, that should allow the thermal pads to become sticky enough to hold again. Remember these things weigh like one gram, they aren't going to fall off easy unless you knock them.