Foot/inch marks in Illustrator?

[Seacrest]

1. Put a font in FontBook -- any font (one with Unicode support)
2. Go to the Special Characters palette and choose "Punctuation."
3. Choose the symbol you need and drag into Illus.
4. Change the font to the actual font you want to use.

4a. If the glyph does not exist in the font, then it probably won't show up.
4b. IIRC, those symbols exist in the Symbol font, but I do not remember the key combo.