Hy hippydave, the Napa part number for a re-manufactured master cylinder for your 58 Viking 60 is NMC P21698 $46.49, their part number for a new master cylinder is NMC M21698 $154.49, there was no mention of core costs. It is not the best idea to tag onto someone elses post and ask questions, please start your own posts, there is a better chance your questions will be noticed and answered, hope that helps.
