Doug,
I did a lot of research on this for my build
* The ones commonly available (Finishline) aren't even close to original
* You can get the red warning light from VictoriaBritish.com it is also used on the MGA
* The only place I've found the green and blue lights is in England and they are pretty pricey
* I found a decent alternate, it has a beveled chrome bezel and available in red, green and blue. CML *192A0250, 255 and 257 You can get them from Newark Electronics or Allied Electronics.
For some reason, the file upload feature isn't working so this is a link to the Newark page that has a picture:
192A0257 - Blue Panel Light
Hope this helps
Paul