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NB Miata Window Regulators and Motors: Manual 1999-2000 vs Power 1999-2005
US/LHD 1999-2005 NB Mazda Miata/MX-5. Factory manual-window regulators are directly documented for 1999-2000; power regulators and separate motors are checked for 1999-2005. NA, third-generation NC, non-US/RHD cars, universal conversion kits and cross-generation interchange are excluded.
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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What you need to know
First identify manual crank versus factory power, then physical RH/passenger or LH/driver. The Mazda collision catalog directly labels the manual branch 1999-2000; current dealer/seller catalogs sometimes broaden NC10-58/59-560F through 2002 or 2005, so later manual-window fitment is unresolved and requires VIN plus installed-number verification. The power regulator and motor are separate catalog pieces. Diagnose switch/wiring, connector, motor operation, cable/regulator damage, guides/bushings, glass alignment and binding before ordering. Secure the glass before regulator or motor removal.
OEM numbers
Manual 1999-2000: RH/passenger regulator NC10-58-560F and LH/driver regulator NC10-59-560Fhandle S084-58-580A-00, snap ring B001-58-585, escutcheon B001-58-582A-00 and pad B092-58-863A. Power 1999-2005: RH/passenger regulator-only NC11-58-590G and motor NC11-58-58XALH/driver regulator-only NC11-59-590G and motor NC11-59-58XA. Checked glass guidance parts include RH/LH division channels NC10-58-604A/NC10-59-604A and guides NA01-58-603D/NA01-59-603D.Supersession
Checked power-regulator service chains terminate at NC11-58-590G RH and NC11-59-590G LH; the current catalog lists NC11-58-590F and multiple NC11-59-590 revisions as replaced by the G suffix. Checked RH motor NC11-58-58X -> NC11-58-58XA. No manual-to-power, side-to-side or generation-to-generation supersession is claimed. NC10/NC11 here are NB service-number prefixes, not the third-generation NC chassis.
Fitment
First identify manual crank versus factory power, then physical RH/passenger or LH/driver. The Mazda collision catalog directly labels the manual branch 1999-2000; current dealer/seller catalogs sometimes broaden NC10-58/59-560F through 2002 or 2005, so later manual-window fitment is unresolved and requires VIN plus installed-number verification. The power regulator and motor are separate catalog pieces. Diagnose switch/wiring, connector, motor operation, cable/regulator damage, guides/bushings, glass alignment and binding before ordering. Secure the glass before regulator or motor removal.
Aftermarket options
Checked choices include genuine manual regulators, genuine power regulator-only mechanisms, genuine power motors, Dorman 742-799 LH motor, specialist replacement regulators and guide/bushing service parts. Never infer that a listing called an assembly includes the motor, glass, switch, guide, mounting hardware or side-specific trim. Universal power-window conversion kits and NA/NC mechanisms are excluded.
Before you buy
Manual regulators are directly documented only for 1999-2000; later seller fitment conflicts, so a later manual-window NB requires VIN and installed-number confirmation. Power regulator-only mechanisms and power motors are separate pieces. Match RH/passenger versus LH/driver, connector and listing contents; diagnose switches/wiring, guides/bushings and glass binding before buying. NC10/NC11 are part prefixes here, not an NC-generation interchange. Secure the glass before service.
Research and fitment sources
Supersede reviewed 14 unique research sources for this guide. 8 also appear above as a seller or official action and are not repeated here; 6 additional citations follow.
Research last verified .