I apologize that's not fitting right up. The BB pumps were never used on the Extreme bodies, always on the SRO's. The Ext's have always used the Sicce 2500's, and now the new Sicce Syncra pumps. You should be able to find some fittings that could help you adapt over though. You might have to get them online from a metric supplier, or maybe give Coralvue a call direct to see if they would have anything that could help.