NB Miata Firewall Plugs for Heater Core & A/C
thingiverse
I used these plugs on my NB Miata track car and was impressed with how snugly they fit into the holes. I haven't had a chance to test them out yet, but I'm confident they'll do their job well. The 26mm and 36mm plugs are designed for the A/C firewall holes, while the 30mm plugs fit perfectly into the heater core holes.
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