I looked, only separate mosfet,northbridge blocks, so after purchasing two blocks, the blocks would be worth more then your motherboard. I would just re paste your lower stock cooler, and grab the mosfet block.
Here's one
EK-MOSFET ASUS 3a X38- Acetal EK-MOSFET ASUS 3a [EK-MOSFET ASUS 3a - Acetal] - $44.99 : DazMode, The Best Canadian PC Watercooling and Modding Store!
And here is a NB block
EK-NB S-MAX - Acetal - Chipset Blocks - Motherboard Blocks - Blocks