Most folks just build the Peerless factory alignment that uses a single PR, but if two are used, then adding enough mass to each PR to raise it to 4x whatever is required for the factory alignment will get you close enough (fractionally higher) to the same Fb (preferably starting with a higher mass PR), though without checking it may not be able to handle a lot of power near/at tuning. Note that you can check it and/or design your own using Unibox and that the PRs should be mounted in a bi-polar pattern to ~cancel out their vibration modes.
GM
GM
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