The 48 was available for the right or left side of the 52. The later 52's with the right side safety needed the sight on the left, so that is the more common model, but the early 52's could have the sight mounted on either side.
Michael,
As the tall sight was used to get the line of sight to the same height as the scope, not to to gain more elevation adjustment, there would be no need to be able to run the sight all the way down, so no need to make the cut in the stock as deep. Just a thought.
It may be possible to take a std slide and weld an extension onto it and have an engraver engrave the markings on it. The long slides are so rare I'd hate to give one up for this project if one could be fabricated. I could probably make the longer screw.
I'll see about getting a better picture, but might be a few days. I've got birthday cake to eat tonight, then leaving early friday for the Tulsa show. I'll put a bid on the brochures, thanks for the heads up.
Thanks,
John