Many dealers will give you a set of the bungs for free if you drop in and see them, they are not unique to the MX-5, other Mazda models use them too.
Check these videos (linked) for an easy way to approach the hood drains:
Many dealers will give you a set of the bungs for free if you drop in and see them, they are not unique to the MX-5, other Mazda models use them too.
Check these videos (linked) for an easy way to approach the hood drains: