INDICATOR SWITCH- Land-Rover Defender Headlamp / Horn Switch. PRC3875 is to chassis No. GA455946 (upto approx 1990) XPB101290 Switch fits from Vin No. WA138450 If you are un-sure of which switch is required for your vehicle, we can identify the correct one from your chassis/vin number. Please see below, which should help. STC439 is from chassis GA455946 to VA104805 (from approx 1990 to 1997) XPB101290 is from chassis WA138450 (from approx 1997 on) The year of manufactuer date is only to be used as a guide, as the manufacturing date will not be the same as registration date; please refer to you chassis/vin numbers for accurate identification.