Need to replace impellers/rings on 1999 1800 Sportster. I was looking at the Solus Concord. I'm wanting to make sure I get the right one for my application. I've called RIVA. They only offered the X series and their part numbers couldn't cross to the Concord series. I tried Powersport Superstore in Texas. They jet pump, bearing, etc. but no impellers! What's going on??? I have the twin 717s and a 140 mm pump but no one can give me a correct part number. I believe it's the SF-CD-15/23 but it doesn't show my application for this impeller.