I use Dowco xxl . I have a tall windscreen on mine and it lives outside all year so I like it down to the bottom of the tires .
 
From what I found, and was told.. they don't make a 'Rocket 3' specific one.
But they have...
Triumph Outdoor Bike Cover - XL
Part Number
A9930496
 
When I put that in my search engine, I get the below being sold on Amazon $159.00. It's not Rocket specific, just a large rain cover with Triumph logo. You are certainly welcome to give it a go however and let us know how it fits your bike and the protection afforded from the elements.

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