From looking at pages 50 & 51, here is what I have so far:
18) GM
?? radiator inlet inter - Dayco
??
27) GM 10080278 radiator inlet front - Dayco 71368 pipe to radiator upper
29) GM 10052300 radiator outlet front - Dayco 71369 pipe to radiator lower
30) GM 10120079 radiator outlet rear - Dayco
??
31) GM 10032771 radiator inlet rear - Dayco 70687 pipe to engine upper
17) hose clamps 33.3 to 57.2 mm