This is the bolt that secures the engine head to the engine block, there are 10 bolts.
https://m.autodoc.co.uk/ajusa/382915I am not 100% sure so please check carefully but I think these are correct. They have the later bolt head style with ribe type pattern (very good as it gives a really secure grip of the tool when torquing up). They are stretch type bolts so require the late type beta torquing sequence. You may also need new washers. If you don't have the correct tool you would need to buy a set of ribe bits, not normally expensive.