All the factory Rover V8 distributors and amplifiers I have seen are Lucas manufacture. The ignition coil is a separate matter and so long as they are electrically equivalent they will work the same regardless of their brand. If you look more carefully at the Bosch catalogue you will see that all Discos to 98 and all RRs from 83 to 94 list the same part number for the original coil: 0-221-122-392 (BO = Bosch Original)
Yes, I know, I said that Bosch catalogues are unreliable, but this is consistent with my experience. As I am a LPG converter, ignition sysyems are top of my list when fault finding is called for.

