Best tire brand / style for vintage 1970's CB750 Honda?

I'm replacing a worn vintage Dunlop rear tube tire on my early CB750 Honda. It's a Dunlop Roadmaster K81 4.25/85 x 18 tire with an H rating.
Note: has remaining Donlop Roadmaster 19" tire on FRONT.
Change tire tread style or Brand for rear replacement?

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