Tyres for Loop Frame

Interested in what people are using on their Loops. I have just bought a V7 850 GT and the tyres are pretty old.
I want something that fills out the mudguards and looks period but still grippy.
Has anyone tried Dunlop k81’s and if so what size ?
Thanks in advance.

Got Avon’s on mine. Maybe not exactly period look but work well. I don’t think you can increase rear size much because of clearance to swinging arm.

+1 for Avons…