Here is the much cheaper alternative to the 129X for any BVM D9 & D14 owners. These also work in the L series of PVMs. The originals cards are getting harder to find and can cost 3 to 4 times what this one does.
BKM-129X card RGB / YPbPr for Sony Monitors. Own a monitor which doesn't have RGB/YPbPr inputs by default but has an optional input slot?. This card designed by skumlos is for you! Most monitors will only allow for one optional input card - check with the manual for your monitor.