sid bulb backlight

Hello fellow Saab owners, I am looking to replace the 1.4V bulbs in my SID unit but so far, been luckier at finding hen's teeth than finding the bulbs in question. In Australia, the 2 most popular electric\electronic spare parts shops (ie, Dick Smith and Jayco Electronics) don't carry these...

Need to replace backlight bulb on SID. Anyone tried DIY? I was wondering if anyone attempted to replace the backlight bulbs on their SID using the same method previously described for seat heater switch. I would definitely like to use $1 radio shack micro bulbs rather than $10+ Saab bulbs...