Speedometer drive gearbox

[Loki]

Starting a restoration of a 1977 CB750 Super Sport, this is a stalled resto which has sat in a shed for several years, all complete or so I've been told! Anyway I'm starting to go through what I've got and discovered the body of the speedo drive gearbox is cracked so I need another one, can anyone help with a part number and is the same box fitted elsewhere so I can cast the net wider? Also the plate that is pinned on the wheel behind the drive is damaged so need another one so need a part number for that as well.
I can see this is going to be just the start of many such requests!
Many Thanks

Loki

 

[Loki]

Looks like someone has been modifying the drive for the speedometer, the recessed plate with the ears that fit under the chrome outer cover has been cut down then rivetted to the alloy hub of the wheel, I have managed to locate used parts to replace all the bodgery to as original so looks like this problem has been overcome, bearings and seals next then lace on a new rim, always more challenges!

Loki