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Explicit manufacturer interchange
Sterling Electric 133/2133BQ appears in the same manufacturer-published cross-reference row as Boston Gear F713 at Match installed ratio · 1.33 in center distance.
Sterling Electric explicitly marks the listed competitor models "Yes" for interchange with 133/2133BQ at 1.33 in center distance in its 2000RA Style BQ Interchange Guide. Rows marked No are intentionally excluded.
The manufacturer explicitly marks the compared model as an interchange in its published table.
Boston Gear F713 and Sterling Electric 133/2133BQ are tied by the published source at Match installed ratio · 1.33 in center distance.
Still verify the exact configured ratio, input/output interfaces, duty, accessories, and installation conditions.