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Not sure it'd necessarily need to be a full length rail, if you got a couple of rem 700 two piece bases that were the right distance apart, the zee rings ought to work, from memory the 10moa...

Alternatively, the burris Z rings with the inserts as someone suggested already, you can increase your elevation in steps of 10moa up or down if I remember rightly

Howa/weatherby vanguard use remington 700 action profile on top, so a remington 20moa base should be the right profile, though the holes may need re-drilled (in the base) as I'm not sure they're the...