Caterpillar part numbers starting 1W5

1W513	Elbow (water lines, aftercooler)	Caterpillar
1W531	Base (filter, fuel)	Caterpillar
1W5420	Adapter (engine block)	Caterpillar
1W5421	Connector (aftercooler)	Caterpillar
1W5728	Sleeve (aftercooler)	Caterpillar

Not listed? Add it yourself.