.....
There's a learned article with photos, on the development process of the tip tanks for the P-80/F-80 and the T-33 here - you probably have to cut and paste and replace the asterisks with the usual b-word -
http://tailhooktopics.**** ****.com/2017/06/lockheed-pf-80-shooting-star-tip-tanks.html
BTW Ex-Doug - Your earlier link doesn't seem to work and nor did mine even with the usual substitution, but I've fiddled it some more. And - I think FA-531 is an F-94A (Bu-Aer No 49-2531) but the example is still relevant.
LFH