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Manufacturer functional interchange
Superior Gearbox B090 appears in the same manufacturer-published cross-reference row as Hub City 321L at Match installed ratio/application · VarioDrive size 090.
Superior Gearbox publishes B090 (VarioDrive size 090, input shaft) as a competitor cross-reference target. Superior describes VarioDrive as functionally interchangeable with listed drives while requiring independent verification of ratings, dimensions, fit and application suitability.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
Hub City 321L and Superior Gearbox B090 are tied by the published source at Match installed ratio/application · VarioDrive size 090.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.