I went through all of the literature that I have, and unfortunately found no mention of either of these options. I have a copy of the "Accessories Installation Manual" that was sent to dealers. It could be that these two options were deemed too simple to need instructions for...although the electric shaver is included!
In the "1951 Chevrolet Engineering Features" Catalogue, there is mention of a Portable Spot Light, but the description sounds like it uses a hook or hanger, not a magnet. There is no part# included.
Good Luck on getting any info... if anyone has a picture of either of these items, or a complete list of all options, I would like to see them as well. My '51 has quite a few options... but there's always room for more!
