Reusing the old
Stud Bolts is simply not worth the risk! The old items will have stretched and have possible thread damage. Either way they will be difficult to torque up properly!
Other lengths of M8
Stud Bolts with the same part code that you may wish to consider:
92900080190B
92900080250B
92900080280B
92900080350B
92900080353E
92900080400E
92900080453E
Use new nuts and washers as well. Interfacing worn parts with new is not such a good idea. Order all the gaskets, seals and other new fasteners at the same time and reduce the shipping costs with one larger order.