Autozone part # 398219:
$17.99 and no tax in DE. This will actually fit better in the top rear of my PC70 than the big momma because I can hax0r up a much thinner shroud for the fans I think.
As an aside, the guy brought me the wrong heatercore at first (398216), and it appeared to be a little shorter than the big momma and with copper fins instead of aluminum. Might be a nice choice for someone looking for a smaller rad...