Got one for my '63 and a battery box from Luttys http://www.luttyschevy.com and I believe the innner fenders are the same as your '66. The parts came from Goodmark but Luttys was the only place that listed them.

'45 Ford PU
66 Valiant wagon, leaning tower of power.
79 Chevy C10 w/250
02 PT Cruiser Convertable