Fueling & Injection - Need a FAST P/N

I'm looking for the O-Ring boss fitting that goes into the rails. I need a -8 JIC on it. So what size is the rails? Should be just ORB.... -8 ORB?

I know my FPR boss fittings were massive.

Would it be this?
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=FS&Product_Code=54023A-1&Category_Code=FuelSystemAcc

anyone??