About any antique tractor show I attend (many of them) have vendors such as Macks Tractor Parts etc. who have plenty of 7/8 Autolite 3077 Plugs and the cooler 7/8 3076 also. I bought some at NAPA not too long ago.
I wouldn't consider them obsolete (plenty for sale at shows) but sure they are 7/8 versus more modern 18mm and for 50 + year old tractors !!!! Here's a BING search for places you may find them
THEY (3077) ARE DEEP REACH HOTTER SIDE WIRE ELECTRODE PLUGS and perform MUCH better then the slightly colder Autolite 3076 in the many older UNSTYLED Deere's I've owned.
The cooler 3076 are quicker to foul then the hotter deep reach 3077 if the engine isn't quite up to snuff...
I seriously doubt NGK or Bosch etc even make them as they are for olddddddd tractors and 7/8 instead of 18 MM.
Use what you like but in the old style 7/8 plugs in unstyled Deeres Ive fooled with, the hotter 3077 perform so much better then 3076. Of course if you cant find any you have to get by with the cooler 3076 and sure they will still work WELL DUH.
DO THE PLACES YOU CALL REALIZE YOU NEED 7/8 PLUGS IN SO MANY OF THE OLDER UNSTYLED TRACTORS ?????????????
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