The original lamps are 8V 300mA, T-3 1/4 style, but with a rounded bulb, like the 7.5V lamps here:
http://home.earthlink.net/~dwojo/si...builderpictures/wedge_screw_bayonet_lamps.jpg
That's from Dave's webpage, but you can't use those 7.5V lamps, as they will be overvolted and their lifespan significantly shortened. I've been using the lamps on the right (the wedge lamp, not the screw lamp), but they are so long that they push up against the faceplate & glass.
Been wanting to try retrofitting the stock lamp holders with these:
http://www.mouser.com/ProductDetail/JKL-Components/2964-6B/?qs=/ha2pyFadujQJS1FtIm%2bMsI0j%2b7gRBni/bVp2ZaTdempkvkmQ42iMA== (no pic, but check the datasheet). These are sockets for the wedge lamps with leads. Since the lamps are properly fitted into a socket, they ought to be recessed properly and not mash against the faceplate. I suspect that the rubber section might be a tad too large to fit perfectly into the stock holder and have been contemplating a method to neatly reduce the diameter of the part that has to press into the metal socket holder on the 700M. Probably a sanding wheel on the Dremel, and a bit of WD-40 on a Q-Tip to apply some lube to the socket to ease its installation.
Only problem with this method is the work involved. 6 lamps and 12 wires to desolder and re-solder. But once done, a burnt-out lamp no longer means a major effort to replace...pop the bad lamp out of the socket and pop a new one in.
Dave sells the lamps you need.
http://www.home.earthlink.net/~dwojo/index.html
If, in the future, these 8V 250mA lamps disappear, you can sub a #192 wedge lamp (13V 330mA). They are noticeably dimmer than the 8V 250mA lamps, but usable and with such an undervolt, they ought to last for decades.