Is there a part number on that bulb ? my 1999 T2 had bulbs out on the speedo & there was 2 types of bulbs IIRC black & these blue ones which I took out of a primera at the breakers to sort out the old trucks dash. Just found a blue bulb & it has Toshiba v-2 wrote on it if it's the same as yours you should be able to get a few at your breakers:thumb2
I had to replace my dash bulbs just after I got my T2, I am sure I consulted a wiring diagram download from this site, that gave me the relevant code number......then fleabay I think.....