Hi, hook at bricklink can be found under 70644, but it is bloody expensive.
additional PF parts at brickling:
1 x XL motor(58121c01)
1 x L motor(99499c01)
5 x M motor(58120c01)
4 x IR reciever(58123bc01)
4 x IR controler(58122c01)I personaly prefer just 3 pcs plus 1 pc(64227) for driving and steering
1 x battery box(59510c01)
1 x PF lights(61930c01)
2 x 20 cm extension cable(60656)
Hope I did not forget anything.
It is a great moc. Built it and then check this, last two thirds of the page:) http://www.eurobricks.com/forum/index.php?showtopic=85388&st=175