Hard Dog Roll Bar Application Guide

Bethania Garage Inc. & Hard Dog Fabrication

First and Second Generation Miata (1990 - 2005) Application Guide

Bar Type	Hard Top	NB Size Glass Rear Window Soft Top	SCCA Time Trials	SCCA Solo I	NASA HPDE	Schematic - View Bar Position
AC - Ace	YES	YES*	YES**	YES**	YES**	Ace
D - Deuce	YES	YES*			YES***	Deuce
HB - Hard Bar	YES	YES*				Hard Bar
HS - M1 Sport	YES		YES**		YES**	M1 Sport
AB - M1 Hard Core			YES	YES	YES	M1 Hard Core
TB - M1 Hard Core Hardtop	YES		YES	YES	YES	M1 Hard Core Hardtop
9B - M2 Hard Core		YES	YES	YES	YES	M2 Hard Core
NB - M2 Hard Core Hardtop	YES	YES	YES	YES	YES	M2 Hard Core Hardtop
9S - M2 Sport	YES	YES*	YES**		YES**	M2 Sport
X - Xtreme	YES	YES*				Xtreme

*Compatible with most larger than stock NB glass windows. Contact Us for fitment confirmation if your glass exceeds the dimension given below.
**Compliant with at least one diagonal brace. A harness bar is also recommended.
*** Center Braced only

All 1990 - 1997 Miatas came from the factory with a flexible plastic rear window in the convertible top. If your first generation Miata has a glass rear window, it's either aftermarket or a second generation transplant. The basic 1990 - 2005 Miata chassis didn't change allowing the tops and roll bars to interchange. A few quick measurements are very helpful when trying to determine just which bar is compatible. If your glass is larger than the factory NB spec given below, Contact Us for fitment confirmation.

Factory NB (second generation 1999 - 2005) Convertible Top Glass Rear Window Dimensions for comparison:

14" Tall in the center
32.25" Wide across the top measured just below the upper corner radius (approx 2.5" down from the top edge)
Be sure to include the complete assembly including all rigid parts around the edge. Not just the veiwing area.
Width measurements across the bottom of the glass are not of concern.

WARNING: This article is sold without warranty, expressed or implied. No warranty is made to this product's ability to protect the user from any injury or death. The user assumes that risk.

Updated Dec 10, 2018 3:24 PM