It is low profile enough not to require any modification to the wood above and again sits perfectly in the compartment using the small Amel wood block set on edge at the end (about 1") . This size and type is specified for some of the larger Mercedes (etc) automobiles with the larger V8 diesels and had plenty of muscle for our engines. Bosch has an S3, S4, S5 .  The S3 probably fine, the S4 better, and the S5 with some capacity for higher drain electrics on cars (probably unnecessary but may be a help if your starter battery goes without charging for a longer period of time). 

You can see the specs on the S5015 here (random vendor)  https://www.tayna.co.uk/S5-015-Bosch-Car-Battery-Type-020-S5015-P9707.html 

From Bosch progaganda....

"The Bosch S5 Battery will tolerate short journeys better than any other battery in its price range. Maintenance Free Silver Calcium technology lies at the heart of the Bosch S5 battery series with Labyrinth Lid Technology and superior internal grid construction.  The Bosch S5 can sit for 18+ Months (charged) and its performance will not be compromised."  Impressive looking in the battery compartment BTW (when Adm Bill saw it in Siracusa).  I am away from KAIMI but will post a pic when I return to Malta.