Bell & Colville have a useful web site with parts diagrams which also advise when a part has been superseded by a newer one.
Their prices are also very similar to OPC and probably less than D911 so worth a look.
https://www.deroure.com/diagrams.asp?TBL=2586&MAK=3&MDL=25&SMA=0&SMO=0&ST=99737503303&SC=1
Their prices are also very similar to OPC and probably less than D911 so worth a look.
https://www.deroure.com/diagrams.asp?TBL=2586&MAK=3&MDL=25&SMA=0&SMO=0&ST=99737503303&SC=1