universal water block clamp from
http://www.overclockershideout.com
it's a failry large clamp with an adjustable screw that will allow you to clamp down the small and the large items, plus it will let you start small and get big.
two flavours slot one/A and socket 1/a:
<img src=http://www.overclockershideout.com/Merchant2/graphics/00000001/image01107.gif>
<img src=http://www.overclockershideout.com/Merchant2/graphics/00000001/image0091.gif>