Not sure where to refer you to but, your best value would be buying after market parts from Aladdin (they make the parts but I don't they will sell to the public). They make a Go-Kit which will probably include everything you need for a fair price.
The Go-Kit is their part number: GO-KIT-32.
The parts in this kit include:
O-304 Seal Plate O-Ring
O-359 Diffuser O-RIng
O-Impellar O-RIng
AS-1000 Seal
O-108 Lid O-Ring
Josh
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