Electric vehicle power component selection help
FAN3121 and FAN3122 MOSFET drivers from Fairchild look good and are "about" the same spec as the IDXX414. They have a peak drive capability of about 9A and from a quick look it seems their pin out is nominally the same.

The IRFP260N is good for operating at 170ºC and is rated at 200V, 50A with an on resistance of 0.04 ohms. Gate drive at 10V is surprisingly low for this type of device too. There are probably better devices but I've used one of these before and given it a fair bit of stick.

EDIT


IRFP260 drops about 0.8V at 20A - 16W per device
IPP110 drops about 0.2V at 20A - 4W per device
IRFP4668 drops about 0.18V at 20A - 3.6W per device