Hello,
The sizes are 14mm for the main bolts, but you must disconnect the battery first. Here is a guide that will work you through the repair and diagrams below to show you how it will be for your car:
https://www.2carpros.com/articles/how-to-replace-a-starter-motor
Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.
Cheers, Ken
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Oct 3, 2018 at 3:51 PM