51 mercury bellhousing

[rotorwrench]

The T170-FT RTS transmissions have the wide Ford pattern so an adapter might be needed similar to the Hogs Head flat plate except with the early Ford narrow bolt pattern from 49 to 64 to the wide Ford pattern on top loaders & Ford T5. I think these boxes have the 6.5 inch long input protrusion so there should be room for an adapter plate to fit up. Some of these transmissions also have dual bolt drillings but the top driver side one doesn't go through due to the RTS case design.