I have a 63 C60 with the typical brake issues with the booster under the cab, but finding a replacement booster is proving to be fruitless. My local NAPA and another local business say they can send mine out to be rebuilt, but with a two month turn around and no guarantees that they will have all the parts needed. I'm considering a build to move a more modern vacuum booster and master cylinder to the fire wall. Does anyone have any info on this being done before? If so, what master cylinder was used?