Hi jackg, re your chain-case cover, the one from the earlier model would have its attachment screws horizontally across the cover, where the Rover-SB has the screws vertically, so it can't be done. Incidentally, the orange plug in your electric cover in for an edger attachment that was an optional extra for the Model 45....They were not a success and very flimsy. Most users got rid of them.
Re your electric, that could be easily be restored as a petrol model, all you would need is the engine shaft, clutch assembly and of course an engine to suit....but being a 14" chassis, I don't think it would be worth the money spent. Of course you could restore it as an electric. Spare parts are available.
