Bonneville Chrome/alloy Chain Guard

Try squaredeals

 

See if you can get your original guard chrome plated it may be cheaper than buying new.
If you know any local little places even better, most guys enjoy helping bikers out.

 

Might be the way to go Rudeboy.
You could customise your guard with a pattern of holes or shapes prior to chrome plating.
Make it unique!
There used to be loads of little back street platers in the 70s, I remember all the scooter boys having all sorts of parts plated.
I had all my Norton Dominator bits done for £25