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I'm not familiar with your particular bike. However, I have attached a picture of the main wiring harness from the parts manual and this shows 2 ring connectors which I would imagine sit on bolts which attach something to the frame. I would suggest that these might be the additional earths that you are looking for.
I have searched the forums. It seems not much available battery wise in 12v. But after
extensive research I have decided on a Motobatt MB3U. It is a exact replacement
size wise. Nice thing is that it is a glass mat battery made specifically for motorcycles
and high vibrations applications. My project is moving along nicely. But of course as I get
into it I decide to do this and that and it extends the timeframe of when it will be done.
I sympathise, although in my case I have 4 restos on the go where I keep on finding new things that need doing and I also need to find time to put parts that I have duplicates of on ebay. Manana, manana!!