Hello ncbred77. You can do a search on this site to find information on about anything related to bottles. I did a quick search and found this info for you that other forum members have posted. I think there are more links out there if you need them.
Hey NC77 , goto a junk yard and get trunk springs from a trunk lid of a car from the 70's or 80's . The bigger the lid the thicker the rod will be and longer also (we're talking probes now) . Early to mid 90's hondas also use them but much smaller diameter rod .