I have a Pro Circuit Works Pipe for my 1992 RMX250 on the way and I have not been able to find a supplier for the 304 silencer. All the stores I have contacted say it it no longer available. However, the 1992 RM250 version is still available. Does any know what is different about them and will the RM silencer fit on the RMX? The part number for the RMX version is SS91250X-304 and for the RM it is SS91250-304. Any help will be greatly appreciated. Cheers, David.