to get your reg marks, in illustrator set up a blank document, like 5" x 5", or whatever, it doesn't really matter. Draw a square or something inside of it. You have to have something on the page because you are going to print to a PDF.
Choose file/print and in the box where you choose your printer choose adobe PDF from the list. Also, in the print dialogue box, in the "marks and bleed" section choose "all printers marks", now press print. (note that this is completely different than saving as a PDF)
this will "print" a PDF file to your desktop, or wherever you save it. open this file in illustrator and you have all vector printers marks.
i took the ones i use, reg marks and center marks, expanded them into compound shapes and saved them as a template. any time i need them now i just choose file/new from template and there they are, ready to go.