Motor mount

Just use your 318 mounts, it's not a big deal.
Or if you decide to order new 360 mounts qnyway (available at most parts stores- NAPA, O'Reiley, Rock Auto, etc.), you need to realize that what you'll actually be getting are the 318 brackets anyway. Compare the part numbers... They're supposed to be different (driver's side), but it's not a big issue- just that the new replacement ones are a poorer quality than the factory ones are, so you may want to just put new inserts into your existing brackets if you feel they are too worn out.
This thread details the differences and how to overcome them.
360 CI mtor mounts.