Help identifying washers included 2801 gasket set

Hi,

Just been delivered STC2801G Payen gasket set and it comes with 5 copper washers which im having trouble identifying where they go.

Items as follow:
1 x thick washer (sump plug sealing?)
1 x washer with a small notch in it
2 x thin washer
1 x smaller diameter washer than the rest

Also, there are two rubber o-rings (same diameter) through one may have been for the crankshaft but they are too small.

Any help would be appreciated.

Thanks
Rob

anyone help on this? particularly on the 2 o-rings.

feed pipe to oil pump has an o ring as does oil filter head waxstat adptor,drain plug on block has copper washer