Replacement bulbs-MK1 and MK2.5

Here is a list of suitable replacement bulbs for a 1990 Mk1 car.


Headlights Dip /Main beam H4. 60/55 watt. Base description P43t Type description; H4

Sidelights front RW501 5 watt Base description W2.1x9.5d Type description W5W

Front Indicator RW382 21 watt.Base description: BA15s Type description; P21W

Rear stop and tail RW380 21/5 watt…Base description: BAY15d Type description; P21/5W

Rear indicator RW382 21 watt…Base description: BA15s Type description; P21W

3rd brake light bulb 681593 HAL BULB HBU955 16W [Halfords]

Fog light RW382 21 watt.Base description: BA15s Type description; P21W

Number plate 2 X wedge base all glass RW501 5 watt.Base description W2.1x9.5d Type description W5W [For Roadsters
Halfords Ref HBU207. This reference ties into bulb type 382. 15mm bayonet with directly opposed pins.]

Interior lights 2 x Festoon Code: R261 S7d Thin Festoon 8 X 26

Ash tray capless RW284 2.3 watt.?????

Heater panel 2 x capless RW286 1.2 watt (the originals are slightly bigger dealer only but RW286 fits OK) .Base description W2x4.6d / size 18x5mm

Hazard switch 12 volt 65mA wired sub minature bulb (Maplins part No PG 78K which is red)

Headlight retract switch 12 volt 65mA wired sub minature bulb (Maplins part No PG77J which is clear)

Instruments capless RW504 3 watt.Base description W2.1x9.5d note this is same size as 5 watt wedge

Warning lights capless RW286 1.2 watt..Base description W2x4.6d / size 18x5mm

The instrument panel bulbs consist of 4 green RW504 bulb holders they light the gauges, the bulbs have a green coloured rubber sleeve fitted this should be carefully removed and fitted to any replacement bulbs, incidentally these bulbs can be changed for coloured LED`s if you fancy a change of colour.

There are 3 black RW504 bulb holders these are plain bulbs 2 for L/R indicator lights and 1 for main beam indicator.

There are 5 RW286 bulbs which are for charge light, brake warning light, fog light and hazard warning and headlight retractor function.

The RW part numbers are Ring Automotive bulbs which should be widely available.

Bulb List Mazda MX5 2.5

Location Voltage/Wattage Colour/Qty Type
Headlamp Dipped Beam 12 volt 55 Watts Clear x 2 HB4*
Headlamp Main Beam 12 volt 60 Watts Clear x 2 HB3
Sidelight (front) 12 volt 5 Watt Capless  Clear x 2 501
Indicator (front) 12 volt 21 Watts Amber x 2 581
Indicator (side) 12 volt 5 Watts Capless Clear* x 2 501
Interior 12 volt 5 Watt Festoon 30 mm Clear x 1 269
High Level Brake Light 12 volt 21 Watts Clear x 1 382
Number Plate/Boot Light 12 volt 5 Watts Capless Clear x 2 501
Stop & Tail 12 volt 21/5 Watts Capless Clear x 2 580
Reverse Light 12 volt 21 Watts Capless Clear x 1 582
Fog Light 12 volt 21 watts Capless Clear x 1 582
Indicator Rear 12 volt 21 Watts Capless Amber x 2 582A
* If clear lenses are fitted then use 2 x 12v 5w Capless Amber bulbs type 501A.

 * Headlamp HB4 dipped bulbs were replaced in 2003 by (H7?) 55 Watt bulbs (from VIN numbers 413680)