Reusing the old Bolt is simply not worth the risk! The old item may have been stretched and have possible thread damage - Either way they will be difficult to torque up properly!
This is the M10 x 20 HEX Bolt(A).
Any machine is only as good as the quality and precision of its fasteners.
Did you need to order gaskets and seals - CMS probably have most or all of what you require.
Our pro-workshop gasket sealant: 08C70K0234M to complete the job like a professional.