usa parts has them for the 64 all v8 300 and 330 engines for $38.58.
www.usapartssupply.com 1-800-872-2013. might also check with
www.nosgm.com. im surprised that your local auto parts store cant get them. if those dont work you might pick up a hemmings catalog and go through the section covering oldsmobiles. im sure you could find something there. chris