Manufacturer comparison guide
Winsmith 045 appears in the same manufacturer-published cross-reference row as STM RMI40 at Match installed ratio/application · Winsmith ALRN size 045.
Winsmith publishes ALRN 045 in its 2025 interchange guide beside the listed competitor models. The guide distinguishes 100% interchangeable mounting from slightly different mounting; verify the source key, dimensions, ratio and application before ordering.
The manufacturer publishes these models together in an interchange/comparison guide.
STM RMI40 and Winsmith 045 are tied by the published source at Match installed ratio/application · Winsmith ALRN size 045.
The guide may include mounting or configuration differences; confirm the source key and exact dimensions before substitution.