Looking for nylon spacers for a sedra 5000?

[ahullsb]

I'm trying to get this thing running, and don't have spacers with the unit I bought. It is part # 13 in the link posted below. Someone told me I may not need it though. Any thoughts?

http://www.premiumaquatics.com/Merc...OD&Product_Code=ASM-SED5000-15&Category_Code=