yet more information:
http://www.trucknvans.com/89_G14_SAXO_Xenon_Super_White_Bulb_p/sxg14sw.htm
#89 / G14 - 12v8w
may be the exact replacement. G14 is the right bulb number.
http://www.trucknvans.com/T10_BA9S_SAXO_Xenon_Super_White_Bulb_p/sxt10ba9s.htm
#T10 Ba9s - 12v8w
has the right base ba9s
this appears to be the exact bulb -
12v/8w/ba9s/g15mm
http://www.donsbulbs.com/cgi-bin/r/b.pl/12v|8w|ba9s.html
looks like either of these will work:
G14/BA9S
http://www.projdm.com/product_3355_9810.html
Polarg B1 Hybrid M26 756 (P8716W*)
Product Description:
Polarg B1-Hybrid M26 Bulb, Japan Application: G14, U.S. Application: 756. Quantity: 2, Wattage: 12v 8w, Color: White. Polarg B1 Hybrid 756 in Hyper White, Type = 756, 1815, 1889, 1891, 1893, 1895, 12929, 12814, Wattage = 8W. High-Efficiency White Bulb Which Dress Up Position Lamp, Reae Lamp, and License Plate Light With A Cool White Grow. High Efficiency Color Bulbs Exclusively For Rear Combination Lamps (Brake & Tail) And Winkers Dressed Up With Clear Len.
T10/BA9S
http://www.projdm.com/product_3355_9801.html
Polarg B1 Hybrid M17 756 (P8701W*)
Product Description:
Polarg B1-Hybrid M17 Bulb, Japan Application: T10BA9S, U.S. Application: 756. Quantity: 2, Wattage: 12v 8w, Color: White. City Light Bulbs, Polarg B1 Hybrid 756 in Hyper White, Type = 756, 1815, 1889, 1891, 1893, 1895, 12929, 12814, Wattage = 10W. High-Efficiency White Bulb Which Dress Up Position Lamp, Reae Lamp, and License Plate Light With A Cool White Grow. High Efficiency Color Bulbs Exclusively For Rear Combination Lamps (Brake & Tail) And Winkers Dressed Up With Clear Len.