I self-installed the Hard Dog roll bar. I read this beforehand and is mostly accurate other than some questionable suggestions; use your common sense:
kentbigdog.com
Manufacturer instructions:
For removal/re-install of interior, I used the ND shop manual

Roll bar installation instructions for a Mazda MX5 RF
Installing the Flyin' Miata / Hard Dog roll bar in a Mazda MX5 RF. Step by step instructions.

For removal/re-install of interior, I used the ND shop manual
SEAT BACK BAR LOWER GARNISH REMOVAL/INSTALLATION | 2016 ND Shop Manual
< Previous Next > 1. Open the convertible top. 2. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 3. Remove the following parts: a.
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