hey wayoutcat i bought a newmaster cylinder and brake booster for my 66 impala i had a friend get it for me,i dont know who he got it from but i'll ask him and let you know. i'll post it here as soon as i find out.
i just checked my paddock catalog and there in there . is there somthing specifc your looking for? if you want to convert your stock single cylinder for a dual you might have to mix and match some parts. <a href="http://www.paddockparts.com" target="_blank">www.paddockparts.com</a> if you haven't looked there yet. let me know if you need anything else.