truck: 1990 c1500 350

Replacing my oil pan gasket and adapter gaskets but i am having a hard time finding out where all the gaskets go.

no. 1: Probably for between the filter and adapter (which is probably not necessary because the oem filter has 1 on it already)
no. 2: Goes between adapter and engine.
no. 3: ???
no. 4: ???
no. 5: ???

If anybody could help that would be greatly appreciated.

 

1, 2, 4 & 5 are all adapter gaskets - there were a lot of different setups for the adapters/coolers on these era trucks so usually all the types are included with sets.

#3 is probably o-rings for the oil sump tube.

Just pick the one that best matches the gasket you had.