Here are eight attachments to accompany my comment in response to Mike Norris's question. Eight may seem too many (!) but they're all necessary in order to get an idea of the very wde choice of gearbox that Dennis offered.
My thanks to Alexander Dennis Limited for their permission to reproduce part of a Dennis document on the Old Bus Photos site.
Ian Thompson
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Old Bus Photos from Saturday 25th April 2009 to Wednesday 3rd January 2024